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Over a 95\u2009min test period, and in a counterbalanced design, 16 young healthy adults underwent 3\u2009\u00d7\u200930\u2009min sessions at the psychomotor vigilance test (PVT), during an early afternoon \u2018dip\u2019 enhanced by a prior night's sleep restriction (5\u2009h). On both occasions they were given a cup of a decaffeinated coffee; once when the participant was verbally primed to suggest the coffee was caffeinated (Placebo) and on the other under neutral priming (Control). There were significantly fewer lapses and shorter reaction times following Placebo, for the initial two 30\u2009min sessions, indicating that suggestion about consuming caffeine was effective in improving performance in moderately sleepy people. 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