bedtime
n. countablen. the time when you go to bed to sleep. It is usually a fixed time each night, especially for children.
n. the time at which a person goes to bed, typically implying a regular or prescribed schedule.
My bedtime is at nine o'clock.
The children have a strict bedtime of eight thirty every school night.
Enforcing a consistent bedtime helped regulate his circadian rhythm and improved his morning alertness.
From Middle English bedtyme, bed-tyme, bedetyme, bedde tyme, equivalent to bed + time. Compare earlier Old English bedtīd (“bedtime”). Compare also West Frisian bêdtiid (“bedtime”), Dutch bedtijd (“bedtime”), Saterland Frisian Bädegungenstied (“bedtime”, literally “bed-goings-time”), German Low German Beddgahnstied, Bettgahnstiet (“bedtime”, literally “bed-goings-time”).