The phrase "bedtime" refers to the time when a person goes to bed or retires for the night. It is usually an established routine, where children are put to bed at a certain time each evening and follow a set sequence of activities such as brushing teeth, getting into pajamas, reading stories, saying prayers, etc., before lying down in their beds to fall asleep. For adults, it can refer to the same concept but may not involve as many pre-sleep rituals or routines.