# sleep cycle

One round of the stages of sleep, from light sleep down to deep sleep and on to dreaming sleep. Each lasts about ninety minutes on average, though the length varies, and a night holds four to six of them.

## Where it comes up

- [Are naps good for you?](https://nitez.com/are-naps-good-for-you)
- [Why do I keep waking up at 3am?](https://nitez.com/waking-at-3am)
- [Why am I still tired after a full night’s sleep?](https://nitez.com/tired-after-sleeping)
- [What happens while we sleep?](https://nitez.com/stages-of-sleep)
- [How can I help my child sleep?](https://nitez.com/children-and-sleep)
- [How much should my newborn sleep, and how do I keep them safe?](https://nitez.com/newborn-sleep)

https://nitez.com/words/sleep-cycle