Study of Sleep Inertia in Major Depressive Disorder by the Psychomotor Vigilance Task

Five PVT tests (before sleep at 7pm, 7am, 7:30am, 8am and 11am). The PVT is a 10-minute test designed to assess the vigilance and sustained attention by measuring reaction times (RT) to visual stimuli. During the test, participants are required to monitor the computer screen and press the response button as soon as a millisecond counter appears which will stop the counter and display the RT in milliseconds. The stimuli are randomly presented.

Performed overnight as part of routine care (11 p.m. to 7 a.m.).

Actimeter and sleep diary to assess the sleep-wake patterns of the participants in their natural environments over a two-week period.