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MOR\u2019s are ubiquitously present throughout the brain, posing a challenge for understanding the precise anatomical substrates that mediate opioid induced respiratory depression (OIRD) that ultimately kills most users. Sleep is a major modulator not only of pain perception, but also for changing the efficacy of opioids as analgesics. Therefore, sleep disturbances are major risk factors for developing opioid overuse, withdrawal, poor treatment response for pain, and addiction relapse. Despite challenges to resolve the neural substrates of respiratory malfunctions during opioid overdose, two main areas, the pre-B\u00f6tzinger complex (preB\u00f6tC) in the medulla and the parabrachial (PB) complex have been implicated in regulating respiratory depression. More recent studies suggest that it is mediation by the PB that causes OIRD. The PB also act as a major node in the upper brain stem that not only receives input from the chemosensory areas in medulla, but also receives nociceptive information from spinal cord. We have previously shown that the PB neurons play an important role in mediating arousal from sleep in response to hypercapnia by its projections to the forebrain arousal centers, and it may also act as a major relay for the pain stimuli. However, due to heterogeneity of cells in the PB, their precise roles in regulating, sleep, analgesia, and respiratory depression, needs addressing. This review sheds light on interactions between sleep and pain, along with dissecting the elements that adversely affects respiration.<\/jats:p>","DOI":"10.3389\/fnins.2023.1134842","type":"journal-article","created":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T00:54:45Z","timestamp":1680742485000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":18,"title":["Opioids, sleep, analgesia and respiratory depression: Their convergence on Mu (\u03bc)-opioid receptors in the parabrachial area"],"prefix":"10.3389","volume":"17","author":[{"given":"Nicole","family":"Lynch","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janayna D.","family":"Lima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard L.","family":"Spinieli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satvinder","family":"Kaur","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2023,4,6]]},"reference":[{"key":"B1","first-page":"556","article-title":"Effect of sleep loss on pain","author":"Alexandre","year":"2020","journal-title":"The Oxford Handbook of the Neurobiology of Pain"},{"key":"B2","doi-asserted-by":"publisher","first-page":"768","DOI":"10.1038\/nm.4329","article-title":"Decreased alertness due to sleep loss increases pain sensitivity in mice.","volume":"23","author":"Alexandre","year":"2017","journal-title":"Nat. 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