To the Editor: The state of impaired cognition, grogginess, and disorientation commonly experienced on awakening from sleep has been referred to as sleep inertia.1 Morning cognitive impairment associated with sleep inertia has been described as modest1 but has not been well quantified. Because some safety-sensitive occupations require individuals to perform immediately on awakening, we directly compared the effects of sleep inertia and sleep deprivation on cognition.
Wertz AT, Ronda JM, Czeisler CA, Wright KP. Effects of Sleep Inertia on Cognition. JAMA. 2006;295(2):159–164. doi:10.1001/jama.295.2.163
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