Examination of the First-Night Effect during the Sleep-Onset Period

The present study examined the first-night effect during the sleep-onset period using the 9 electroencephalogram stage scoring system.After a week of monitoring sleep-wake habits with sleep diaries and wrist actigraphy, polysomnography recording was made for 3 consecutive nights.Participants slept in their own private, individual, temperature-controlled bedroom in a sleep laboratory at the university.Eleven healthy student volunteers (5 women...