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The first three are considered non-rapid eye movement (NREM) sleep, also known as quiet sleep. The fourth is rapid eye movement (REM) sleep, also known as active sleep. Each sleep stage has a unique function and role in maintaining your brain’s overall cognitive performance.
Non-rapid eye movement (NREM) sleep encompasses three sleep stages , referred to as stage 1, stage 2, and stage 3 NREM sleep. While unique mental processes characterize each stage, they share a tendency for the sleeper to experience slowed breathing, muscle activity, heartbeat, and brain waves.
You need stage 3 NREM sleep to wake up feeling rested. Without enough stage 3 sleep, you feel tired and drained even if you slept for a long time. That’s why your body automatically tries to get as much stage 3 sleep into your sleeping period as early as possible.
When you sleep, you go through cycles that last between 90 and 120 minutes. Each cycle includes three stages of non-REM (NREM) sleep and a stage of REM sleep. Here are the three stages...
REM sleep follows the three stages of NREM sleep. The Rapid Eye Movement Phase is a highly neurological and physical period. During REM sleep, the eyes quickly move from side to side underneath the eyelids. Next, brain activity increases and is similar to when the individual is awake.
During the night, we cycle through four stages of sleep: three NREM stages, and one REM stage. Learn more about what happens in our bodies and minds during these sleep stages.
The first three stages are part of NREM sleep, and the fourth stage is REM sleep, during which rapid eye movement occurs. Approximately 75% to 80% of sleep is spent in NREM sleep. The first full NREM-REM sleep cycle is typically shorter, lasting around 70 to 100 minutes.
NREM1 is the lightest and shortest stage, lasting for approximately 5% of the sleep cycle, or roughly 5 minutes. During NREM1, breathing remains regular, muscles are still active, and the brain begins moving between consciousness and unconsciousness. It is still easy to be awakened in this phase.
There are five different sleep stages, including REM (rapid eye movement) and NREM (non-rapid eye movement) sleep. The five stages make one sleep cycle, which usually repeats every 90 to 110 minutes. Stage 1 non-REM sleep marks the transition from wakefulness to sleep.
Most adults will enter sleep from the drowsy state into NREM sleep. NREM sleep is divided into three sub-stages: stage N1, stage N2, and stage N3. Older classification had four stages of...