{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T16:58:26Z","timestamp":1792083506292,"version":"4.4.0"},"reference-count":62,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2023,2,10]],"date-time":"2023-02-10T00:00:00Z","timestamp":1675987200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Regional Development Fund (ERDF) and the Free and Hanseatic City of Hamburg\/Ministry of Labour, Health, Social, Family Affairs, and Integration","award":["1364-106"],"award-info":[{"award-number":["1364-106"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>As seafarers are assumed to have an increased risk profile for sleep-related breathing disorders, this cross-sectional observational study measured (a) the feasibility and quality of polysomnography (PSG) on board merchant ships, (b) sleep macro- and microarchitecture, (c) sleep-related breathing disorders, such as obstructive sleep apnea (OSA), using the apnea\u2013hypopnea index (AHI), and (d) subjective and objective sleepiness using the Epworth Sleepiness Scale (ESS) and pupillometry. Measurements were carried out on two container ships and a bulk carrier. A total of 19 out of 73 male seafarers participated. The PSG\u2019s signal qualities and impedances were comparable to those in a sleep laboratory without unusual artifacts. Compared to the normal population, seafarers had a lower total sleep time, a shift of deep sleep phases in favor of light sleep phases as well as an increased arousal index. Additionally, 73.7% of the seafarers were diagnosed with at least mild OSA (AHI \u2265 5) and 15.8% with severe OSA (AHI \u2265 30). In general, seafarers slept in the supine position with a remarkable frequency of breathing cessations. A total of 61.1% of the seafarers had increased subjective daytime sleepiness (ESS &gt; 5). Pupillometry results for objective sleepiness revealed a mean relative pupillary unrest index (rPUI) of 1.2 (SD 0.7) in both occupational groups. In addition, significantly poorer objective sleep quality was found among the watchkeepers. A need for action with regard to poor sleep quality and daytime sleepiness of seafarers on board is indicated. A slightly increased prevalence of OSA among seafarers is likely.<\/jats:p>","DOI":"10.3390\/ijerph20043168","type":"journal-article","created":{"date-parts":[[2023,2,13]],"date-time":"2023-02-13T02:42:33Z","timestamp":1676256153000},"page":"3168","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Sleep Architecture and Sleep-Related Breathing Disorders of Seafarers on Board Merchant Ships: A Polysomnographic Pilot Field Study on the High Seas"],"prefix":"10.3390","volume":"20","author":[{"given":"Fiona","family":"Kerkamm","sequence":"first","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2788-5529","authenticated-orcid":false,"given":"Dorothee","family":"Dengler","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthias","family":"Eichler","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Danuta","family":"Materzok-K\u00f6ppen","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lukas","family":"Belz","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3107-075X","authenticated-orcid":false,"given":"Felix Alexander","family":"Neumann","sequence":"additional","affiliation":[{"name":"Preventive Medicine and Nutrition, Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5377-5956","authenticated-orcid":false,"given":"Birgit-Christiane","family":"Zyriax","sequence":"additional","affiliation":[{"name":"Preventive Medicine and Nutrition, Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volker","family":"Harth","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcus","family":"Oldenburg","sequence":"additional","affiliation":[{"name":"Institute for Occupational and Maritime Medicine Hamburg (ZfAM), University Medical Center Hamburg-Eppendorf (UKE), 20459 Hamburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"249","DOI":"10.1539\/joh.K10004","article-title":"Occupational Risks and Challenges of Seafaring","volume":"52","author":"Oldenburg","year":"2010","journal-title":"J. Occup. Health"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"462","DOI":"10.1177\/0018720820906050","article-title":"Habitability in Berthing Compartments and Well-Being of Sailors Working on U.S. Navy Surface Ships","volume":"63","author":"Matsangas","year":"2020","journal-title":"Hum. Factors: J. Hum. Factors Ergon. Soc."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"733","DOI":"10.1002\/ajim.20814","article-title":"Fatigue at sea in Swedish shipping-a field study","volume":"53","author":"Dahlgren","year":"2010","journal-title":"Am. J. Ind. Med."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"e028449","DOI":"10.1136\/bmjopen-2018-028449","article-title":"Sleepiness of day workers and watchkeepers on board at high seas: A cross-sectional study","volume":"9","author":"Oldenburg","year":"2019","journal-title":"BMJ Open"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1299","DOI":"10.1080\/07420528.2020.1810062","article-title":"Does the quality of life differ for shift workers compared to day workers?","volume":"37","author":"Shattuck","year":"2020","journal-title":"Chrono. Int."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Oldenburg, M., and Jensen, H.-J. (2019). Stress and Strain among Seafarers Related to the Occupational Groups. Int. J. Environ. Res. Public Health, 16.","DOI":"10.3390\/ijerph16071153"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Baumler, R., De Klerk, Y., Manuel, M.E., and Carballo Pi\u00f1eiro, L. (2020). A Culture of Adjustment, Evaluating the Implementation of the Current Maritime Regulatory Framework on Rest and Work Hours (EVREST), World Maritime University.","DOI":"10.21677\/wmu20201108"},{"key":"ref_8","first-page":"260106020960878","article-title":"Eating behaviors in sailors of the United States Navy: Meal-to-sleep intervals","volume":"27","author":"Shattuck","year":"2020","journal-title":"Nutr. Health"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Kerkamm, F., Dengler, D., Eichler, M., Materzok-K\u00f6ppen, D., Belz, L., Neumann, F.A., Zyriax, B.C., Harth, V., and Oldenburg, M. (2021). Measurement Methods of Fatigue, Sleepiness, and Sleep Behaviour Aboard Ships: A Systematic Review. Int. J. Environ. Res. Public Health, 19.","DOI":"10.3390\/ijerph19010120"},{"key":"ref_10","first-page":"97","article-title":"S3-Leitlinie Nicht erholsamer Schlaf\/Schlafst\u00f6rungen\u2014Kapitel \u201cSchlafbezogene Atmungsst\u00f6rungen\u201d","volume":"20","author":"Mayer","year":"2016","journal-title":"Somnologie"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1108","DOI":"10.3109\/07420528.2013.800874","article-title":"Sleep, Sleepiness, and Neurobehavioral Performance While on Watch in a Simulated 4 Hours on\/8 Hours off Maritime Watch System","volume":"30","author":"Kircher","year":"2013","journal-title":"Chrono. Int."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1241","DOI":"10.1080\/07420520601083409","article-title":"Train Drivers\u2019 Sleep Quality and Quantity during Extended Relay Operations","volume":"23","author":"Jay","year":"2006","journal-title":"Chrono. Int."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"109","DOI":"10.5665\/sleep.2312","article-title":"In-Flight Sleep of Flight Crew During a 7-hour Rest Break: Implications for Research and Flight Safety","volume":"36","author":"Signal","year":"2013","journal-title":"Sleep"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1016\/S1369-8478(01)00007-9","article-title":"Sleep, watchkeeping and accidents: A content analysis of incident at sea reports","volume":"3","author":"Phillips","year":"2000","journal-title":"Transp. Res. Part F Traffic Psychol. Behav."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1136\/ip.2007.016766","article-title":"A systematic review of epidemiological studies investigating risk factors for work-related road traffic crashes and injuries","volume":"14","author":"Robb","year":"2008","journal-title":"Inj. Prev."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"961","DOI":"10.1097\/JOM.0000000000000837","article-title":"Causes and Consequences of Occupational Fatigue: Meta-Analysis and Systems Model","volume":"58","author":"Techera","year":"2016","journal-title":"J. Occup. Environ. Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"498","DOI":"10.1016\/j.aap.2009.11.011","article-title":"The link between fatigue and safety","volume":"43","author":"Williamson","year":"2011","journal-title":"Accid. Anal. Prev."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"53","DOI":"10.5603\/IMH.2014.0012","article-title":"Risk of cardiovascular diseases in seafarers","volume":"65","author":"Oldenburg","year":"2014","journal-title":"Int. Marit. Health"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Sagaro, G., Battineni, G., Di Canio, M., and Amenta, F. (2021). Self-Reported Modifiable Risk Factors of Cardiovascular Disease among Seafarers: A Cross-Sectional Study of Prevalence and Clustering. J. Pers. Med., 11.","DOI":"10.3390\/jpm11060512"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"345","DOI":"10.1007\/s00420-019-01486-5","article-title":"Mortality from cardiovascular disease in a cohort of Swedish seafarers","volume":"93","author":"Eriksson","year":"2019","journal-title":"Int. Arch. Occup. Environ. Health"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Von Katzler, R., Zyriax, B.C., Jagemann, B., Westenhoefer, J., Jensen, H.J., Harth, V., and Oldenburg, M. (2019). Lifestyle behaviour and prevalence of cardiovascular risk factors\u2014A pilot study comparing Kiribati and European seafarers. BMC Public Health, 19.","DOI":"10.1186\/s12889-019-7186-2"},{"key":"ref_22","first-page":"107","article-title":"Cardiovascular disease mortality in British merchant shipping and among British seafarers ashore in Britain","volume":"62","author":"Roberts","year":"2010","journal-title":"Int. Marit. Health"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"310","DOI":"10.1016\/S2213-2600(15)00043-0","article-title":"Prevalence of sleep-disordered breathing in the general population: The HypnoLaus study","volume":"3","author":"Heinzer","year":"2015","journal-title":"Lancet Respir. Med."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"597","DOI":"10.5664\/jcsm.2172","article-title":"Rules for Scoring Respiratory Events in Sleep: Update of the 2007 AASM Manual for the Scoring of Sleep and Associated Events. Deliberations of the Sleep Apnea Definitions Task Force of the American Academy of Sleep Medicine","volume":"8","author":"Berry","year":"2012","journal-title":"J. Clin. Sleep Med."},{"key":"ref_25","unstructured":"AASM (2014). International Classification of Sleep Disorders, American Academy of Sleep Medicine. [3rd ed.]."},{"key":"ref_26","first-page":"23","article-title":"Diagnostische Methoden","volume":"Volume 3","author":"Stuck","year":"2017","journal-title":"Praxis der Schlafmedizin: Diagnostik, Differenzialdiagnostik und Therapie bei Erwachsenen und Kindern"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"540","DOI":"10.1093\/sleep\/14.6.540","article-title":"A New Method for Measuring Daytime Sleepiness: The Epworth Sleepiness Scale","volume":"14","author":"Johns","year":"1991","journal-title":"Sleep"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"376","DOI":"10.1093\/sleep\/15.4.376","article-title":"Reliability and Factor Analysis of the Epworth Sleepiness Scale","volume":"15","author":"Johns","year":"1992","journal-title":"Sleep"},{"key":"ref_29","unstructured":"Johns, M.W. (2021, August 08). The Epworth Sleepiness Scale\u2014About the ESS. Available online: https:\/\/epworthsleepinessscale.com\/about-the-ess\/."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"533","DOI":"10.1016\/S2213-2600(19)30057-8","article-title":"Normal polysomnography parameters in healthy adults: A systematic review and meta-analysis","volume":"7","author":"Boulos","year":"2019","journal-title":"Lancet Respir. Med."},{"key":"ref_31","unstructured":"Iber, C., Ancoli-Israel, S., Chesson, A., and Quan, S.F. (2007). The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology, and Technical Specifications, American Academy of Sleep Medicine. [1st ed.]."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1382","DOI":"10.1378\/chest.15-1365","article-title":"Pediatric Home Sleep Apnea Testing: Slowly Getting There!","volume":"148","author":"Tan","year":"2015","journal-title":"Chest"},{"key":"ref_33","first-page":"607","article-title":"An automated algorithm to identify and reject artefacts for quantitative EEG analysis during sleep in patients with sleep-disordered breathing","volume":"19","author":"Dungan","year":"2014","journal-title":"Sleep Breath."},{"key":"ref_34","unstructured":"DGAUM (2021, April 23). S2k-Leitlinie Gesundheitliche Aspekte und Gestaltung von Nacht- und Schichtarbeit. Available online: https:\/\/www.awmf.org\/uploads\/tx_szleitlinien\/002-030l_S2k_Gesundheitliche-Aspekte-Gestaltung-Nacht-und-Schichtarbeit_2020-03.pdf."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"267","DOI":"10.2147\/NSS.S145777","article-title":"Sleep positions and nocturnal body movements based on free-living accelerometer recordings: Association with demographics, lifestyle, and insomnia symptoms","volume":"9","author":"Skarpsno","year":"2017","journal-title":"Nat. Sci. Sleep"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1093\/sleep\/6.1.52","article-title":"Sleep Positions in the Young Adult and Their Relationship with the Subjective Quality of Sleep","volume":"6","author":"Gagnon","year":"1983","journal-title":"Sleep"},{"key":"ref_37","first-page":"1311","article-title":"Obstructive sleep apnea is a common disorder in the population\u2014A review on the epidemiology of sleep apnea","volume":"7","author":"Franklin","year":"2015","journal-title":"J. Thorac. Dis."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"e5","DOI":"10.1016\/S2213-2600(16)00006-0","article-title":"Prevalence of sleep apnoea syndrome in the middle to old age general population","volume":"4","author":"Heinzer","year":"2016","journal-title":"Lancet Respir. Med."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"199","DOI":"10.5603\/IMH.2014.0038","article-title":"Consumption of addictive substances in mariners","volume":"65","author":"Pougnet","year":"2014","journal-title":"Int. Marit. Health"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"648","DOI":"10.3945\/an.115.008623","article-title":"Short Sleep Duration and Dietary Intake: Epidemiologic Evidence, Mechanisms, and Health Implications","volume":"6","author":"Dashti","year":"2015","journal-title":"Adv. Nutr. Int. Rev. J."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1186\/s12995-021-00329-9","article-title":"Eating behaviour and weight development of European and Asian seafarers during stay on board and at home","volume":"16","author":"Neumann","year":"2021","journal-title":"J. Occup. Med. Toxicol."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"463","DOI":"10.5664\/jcsm.7676","article-title":"Objective Relationship Between Sleep Apnea and Frequency of Snoring Assessed by Machine Learning","volume":"15","author":"Alshaer","year":"2019","journal-title":"J. Clin. Sleep Med."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"879","DOI":"10.7205\/MILMED.172.8.879","article-title":"Obstructive Sleep Apnea in Loudly Snoring Army Conscripts","volume":"172","author":"Savolainen","year":"2007","journal-title":"Mil. Med."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Shahid, A., Wilkinson, K., Marcu, S., and Shapiro, C.M. (2012). STOP, THAT and One Hundred Other Sleep Scales, Springer Science & Business Media.","DOI":"10.1007\/978-1-4419-9893-4"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1016\/j.sleh.2014.12.010","article-title":"National sleep foundation\u2019s sleep time duration recommendations: Methodology and results summary","volume":"1","author":"Hirshkowitz","year":"2015","journal-title":"Sleep Health"},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Stuck, B.A., Maurer, J.T., Schlarb, A.A., Schredl, M., and Wee\u00df, H.G. (2017). Praxis der Schlafmedizin: Diagnostik, Differenzialdiagnostik und Therapie bei Erwachsenen und Kindern, Springer. [3rd ed.].","DOI":"10.1007\/978-3-662-54383-2"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"896","DOI":"10.1378\/chest.109.4.896","article-title":"Sleep Fragmentation as a Risk Factor for Hypertension in Middle-aged Nonapneic Snorers","volume":"109","author":"Lofaso","year":"1996","journal-title":"Chest"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"133","DOI":"10.5664\/jcsm.26815","article-title":"The Scoring of Arousal in Sleep: Reliability, Validity, and Alternatives","volume":"3","author":"Bonnet","year":"2007","journal-title":"J. Clin. Sleep Med."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"24983","DOI":"10.3402\/jchimp.v4.24983","article-title":"How to interpret the results of a sleep study","volume":"4","author":"Shrivastava","year":"2014","journal-title":"J. Community Hosp. Intern. Med. Perspect."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"2129","DOI":"10.2147\/NDT.S209806","article-title":"Different diagnostic criteria for periodic leg movements in patients with obstructive sleep apnea after continuous positive airway pressure titration","volume":"15","author":"Huang","year":"2019","journal-title":"Neuropsychiatr. Dis. Treat."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"552","DOI":"10.1111\/j.1469-8986.1990.tb01974.x","article-title":"Sleepiness and REM Sleep Recurrence: The Effects of Stage 2 and REM Sleep Awakenings","volume":"27","author":"Glovinsky","year":"1990","journal-title":"Psychophysiology"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1093\/sleep\/21.6.609","article-title":"The effects of REM sleep deprivation on the level of sleepiness\/alertness","volume":"21","author":"Nykamp","year":"1998","journal-title":"Sleep"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"158","DOI":"10.1016\/j.mjafi.2018.01.005","article-title":"Work\u2013rest pattern, alertness and performance assessment among naval personnel deployed at sea: A cross sectional study","volume":"75","author":"Jaipurkar","year":"2019","journal-title":"Med. J. Armed Forces India"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"85","DOI":"10.4103\/1463-1741.178481","article-title":"Noise and sleep on board vessels in the Royal Norwegian Navy","volume":"18","author":"Sunde","year":"2016","journal-title":"Noise Health"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"803","DOI":"10.7205\/MILMED-D-14-00436","article-title":"Assessment of Sleep Disruption and Sleep Quality in Naval Special Warfare Operators","volume":"180","author":"Harris","year":"2015","journal-title":"Mil. Med."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"1121","DOI":"10.1164\/ajrccm\/144.5.1121","article-title":"Sleep Fragmentation and Ventilatory Responsiveness to Hypercapnia","volume":"144","author":"Espinoza","year":"1991","journal-title":"Am. Rev. Respir. Dis."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1164\/ajrccm.150.2.8049833","article-title":"Effects of sleep deprivation and sleep fragmentation on upper airway collapsibility in normal subjects","volume":"150","author":"Series","year":"1994","journal-title":"Am. J. Respir. Crit. Care Med."},{"key":"ref_58","doi-asserted-by":"crossref","unstructured":"Vold, M.L., Aaseb\u00f8, U., Wilsgaard, T., and Melbye, H. (2015). Low oxygen saturation and mortality in an adult cohort: The Troms\u00f8 study. BMC Pulm. Med., 15.","DOI":"10.1186\/s12890-015-0003-5"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"1551","DOI":"10.1016\/j.rmed.2012.06.016","article-title":"Predictors of oxygen saturation \u226495% in a cross-sectional population based survey","volume":"106","author":"Vold","year":"2012","journal-title":"Respir. Med."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"363","DOI":"10.1016\/j.shaw.2016.05.006","article-title":"Sleep and Fatigue Among Seafarers: The Role of Environmental Stressors, Duration at Sea and Psychological Capital","volume":"7","author":"Hystad","year":"2016","journal-title":"Saf. Health Work"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"361","DOI":"10.1007\/s12199-013-0331-0","article-title":"Association between pupillometric sleepiness measures and sleep latency derived by MSLT in clinically sleepy patients","volume":"18","author":"Yamamoto","year":"2013","journal-title":"Environ. Health Prev. Med."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"1707","DOI":"10.5665\/sleep.1442","article-title":"Correlating Subjective and Objective Sleepiness: Revisiting the Association Using Survival Analysis","volume":"34","author":"Aurora","year":"2011","journal-title":"Sleep"}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/20\/4\/3168\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T18:31:08Z","timestamp":1760121068000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/20\/4\/3168"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,2,10]]},"references-count":62,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2023,2]]}},"alternative-id":["ijerph20043168"],"URL":"https:\/\/doi.org\/10.3390\/ijerph20043168","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,2,10]]}}}