![]() In this stage, a person’s body repairs itself, regrows tissues, strengthens the immune system, and builds bone and muscle. This stage is the hardest to awaken from, and when sleepwalking, bedwetting, and night terrors occur. This is the deepest stage of sleep, also known as slow-wave sleep (SWS), and accounts for about 25% of total sleep time.Ī person’s heart rate, breathing, and brain waves slow to their lowest levels, and muscles completely relax. This stage typically lasts around 25 minutes in the first cycle, with time increasing in each cycle. People spend most of their total sleep time in stage 2 (about 45%). Studies suggest sleep spindles help with memory consolidation. Their body temperature drops and eye movements stop.Ī person’s brain-wave activity slows but they experience brief bursts of electrical activity, known as sleep spindles. In this stage, a person’s heart rate slows and muscles relax further. Their muscles also relax, with occasional twitching.Ī person usually spends only 5% of their total sleep time in stage 1, which typically lasts several minutes at a time. In this stage, a person’s brain waves, heartbeat, breathing, and eye movements slow. This is the lightest stage of NREM sleep, where a person transitions from wakefulness to sleep. Read on to find out more about each stage of sleep. The body cycles through each stage around four to six times over the course of a night. The final stage is rapid eye movement (REM) sleep, where dreaming mostly occurs. Three of these stages are non-rapid eye movement (NREM) sleep, with each stage a progressively deeper sleep. When people sleep, their body goes through four stages of sleep.
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