HIGHLIGHTS
SUMMARY
In clinical conditions, polysomnography (PSG) and sleep questionnaires are usually used as objective and subjective standards, respectively, for the assessment of sleep quality. The up-to-date interpretation of PSG by the American Academy of Sleep Medicine (AASM) divides all sleep time into five stages: stage of wakefulness, stages 1-3 of non-rapid eye movement (stage N1-N3 in NREM) and a stage of rapid eye movement (REM). Researchers have found that in healthy adults, subjective total sleep time is 2 of 20 overrated compared with objective total sleep time, as well as . . .
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