Sleep Cycles Explained: From REM to Non-REM

Sleep progresses through distinct stages, each with unique characteristics.In Stage 1, we experience light sleep, drifting in and out of consciousness.Stage 2 brings slower brain waves with occasional bursts of activity.Stage 3 is deep sleep, characterized by slow delta waves. During this stage, growth hormone is released and body restoration occurs.Delta waves are the hallmark of deep sleep, showing the slowest frequency and highest amplitude.These stages form the Non-REM portion of our sleep cycle.A complete night's sleep consists of multiple 90 to 120 minute cycles.Most adults experience 4 to 6 complete cycles per night, with each cycle lasting about an hour and a half.During each cycle, we progress through different stages of sleep, from light sleep to deep sleep, and finally REM sleep.The proportion of different sleep stages changes throughout the night. Early cycles have more deep sleep, while later cycles have more REM sleep.This natural progression optimizes both physical restoration during deep sleep and mental processing during REM sleep.Disrupting these natural sleep cycles can have significant effects on your health and well-being.