Look up bedtime in Wiktionary, the free dictionary.

Bedtime (also called putting to bed or tucking in) is a ritual part of parenting to help children feel more secure^[1] and become accustomed to a more rigid schedule of sleep than they might prefer. The ritual of bedtime is aimed at facilitating the transition from wakefulness to sleep.^[2] It may involve bedtime stories, children's songs, nursery rhymes, bed-making and getting children to change into nightwear. In some religious households, prayers are said shortly before going to bed.^[3] Sleep training may be part of the bedtime ritual for babies and toddlers.^[4]

In adult use, the term means simply "time for bed", similar to curfew, as in "It's past my bedtime". Some people are accustomed to drinking a nightcap or herbal tea at bedtime. Sleeping coaches are also used to help individuals reach their bedtime goals.^[5] Researchers studying sleep are finding patterns revealing that cell phone use at night disturbs going to sleep at one's bedtime and achieving a good night's sleep.^[6]

Synonyms

Look up lights out in Wiktionary, the free dictionary.

In boarding schools and on trips or holidays that involve young people, the equivalent of bedtime is lights out or lights-out - this term is also used in prisons, hospitals, in the military, and in sleep research.

Newspapers

In the pre-digital newspaper era, a newspaper, usually daily, was "put to bed" when editorial work on the issue had formally ceased, the content was fixed, and printing could begin.