Typically, every 90 to 120 minutes, you go in and out of REM sleep. You dream during REM sleep, but sometimes it can occur during Non-REM sleep.
As you get older, you have less REM sleep.There are three stages of Non-REM sleep, according to the team at Cleveland Clinic.
Here is a breakdown of each stage.Your sleep patterns change as you get older. Babies need 16 to 18 hours of sleep per day for good growth and development.
Read more on powerofpositivity.com