Understanding sleep cycle
Even though you’re not conscious during sleep, your brain is deceptively active. It goes through multiple cycles with distinct brain patterns, and it’s very important to your ability to perform normal functions when you’re awake.
The sleep cycle occurs in five stages, the first four consists of the non REM sleep, and the last stage consists of REM sleep, in adult humans the non REM sleep accounts for about 75 to 80 percent of the total sleep also called as the NREM sleep due to the lack of rapid eye movements in this stage of sleep.
