PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Sleep cycles usually repeat every 90 to 110 minutes. Each cycle is made up of a sequence of different sleep phases. There are two main types of sleep: REM sleep.

Detailed explanation-2: -In a typical night, a person goes through four to six sleep cycles. View Source . Not all sleep cycles are the same length, but on average they last about 90 minutes each.

Detailed explanation-3: -A full sleep cycle takes about 90 to 110 minutes. Your first REM period is short. As the night goes on, you’ll have longer REM sleep and less deep sleep.

Detailed explanation-4: -REM Stage R There are two phases of REM sleep: phasic and tonic. Phasic REM sleep contains bursts of rapid eye movements, while tonic REM sleep does not. Stage R occurs about 90 minutes after you fall asleep, and is the primary “dreaming” stage of sleep.