How often do you have REM per night?

Most adults experience REM (rapid eye movement) sleep about every 90 minutes during the night, typically having 4 to 6 REM cycles. Each REM period usually lasts longer as the night progresses, totaling around 1.5 to 2 hours of REM sleep per night. Factors such as age, sleep quality, and individual differences can influence the amount of REM sleep one gets.