![]() ![]() However, the lack of deep sleep causes significant long-term psychological disorders, such as: aggressive behavior, mood disorders, loss of bearings, etc. ![]() The brain is at rest, the cells are on standby and allow the body to slow down all of its metabolisms. Deep sleep allows the body to recover from physical fatigue. This is the most important phase of sleep because it produces growth hormone, which is important for a child's sleep. Vital signs become regular and eye movements disappear.ĭuring this phase of deep sleep, sleepwalking and night terrors may occur. Unlike REM sleep, muscles are more relaxed, pulse and blood pressure decrease, breathing rate and body temperature decrease. It occurs after falling asleep and takes place from 30 to 45 minutes. Deep sleep: Definition and explanationĭeep sleep precedes REM sleep, it is the slow wave sleep phase. The REM sleep is an important stage of sleep, because it allows mental recovery which unlike slow-wave sleep which is physical recovery. This is also the last phase of sleep and during which dreams occur.ĭuring REM sleep, the brain uses much more energy than during wakefulness, which is why the brain needs more oxygen to maintain an accelerated rhythm. ![]() Breathing and heartbeat are irregular, brain waves also show an accelerated rhythm. Rapid eye movement and muscles are inert (as if paralyzed). The definition of paradoxical sleep, also called REM (Rapid Eye Movement) is the shortest phase of sleep, its duration is 15 to 20 minutes and at this time, brain activity is the most intense. ![]()
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