NREMvaiheista

NREMvaiheista, also known as non-rapid eye movement sleep, is a stage of sleep characterized by the absence of rapid eye movements (REM). It is further divided into three stages: NREM1, NREM2, and NREM3. NREM sleep is essential for physical restoration, cognitive function, and overall health. It accounts for approximately 75-80% of the total sleep time in adults.

NREM1, also known as stage 1 sleep, is the transition from wakefulness to sleep. It is a light sleep stage where the body begins to relax, and the heart rate and breathing slow down. The brain activity is still similar to that of wakefulness, and it is easy to be awakened from this stage.

NREM2, or stage 2 sleep, is a deeper stage of sleep. The brain waves become slower and more synchronized, and the body temperature drops. This stage is crucial for memory consolidation and learning. It is also the stage where most dreams occur.

NREM3, also known as slow-wave sleep (SWS), is the deepest stage of sleep. The brain waves are very slow, and the body is in a state of deep relaxation. This stage is essential for physical restoration, including muscle repair and growth. It is also when the body releases growth hormones.

The duration and proportion of each NREM stage vary throughout the night. In adults, NREM3 sleep is most prominent in the first part of the night, while NREM2 sleep is more prevalent in the later stages. NREM1 sleep is relatively short and occurs throughout the night.