Stage 1 is light sleep where you drift in and out of sleep and can be awakened easily. In this stage, the eyes move slowly and muscle activity slows. During this stage, many people experience sudden muscle contractions preceded by a sensation of falling.
In stage 2, eye movement stops and brain waves become slower with only an occasional burst of rapid brain waves. When a person enters stage 3, extremely slow brain waves called delta waves are interspersed with smaller, faster waves. In stage 4, the brain produces delta waves almost exclusively. Stages 3 and 4 are referred to as deep sleep, and it is very difficult to wake someone from them. In deep sleep, there is no eye movement or muscle activity. This is when some children experience bedwetting, sleepwalking or night terrors.
In the REM period, breathing becomes more rapid, irregular and shallow, eyes jerk rapidly and limb muscles are temporarily paralyzed. Brain waves during this stage increase to levels experienced when a person is awake.
There are 4 non-REM stages and REM sleep.
As of 2008, the American Society of Sleep Medicine combined the stages three and four. So now there are only 3 stages
There are five stages of sleep; Stages 1-4, and then REM (rapid eye movement) sleep, in which dreaming occurs.
quiet sleep
The deepest stage of sleep is REM or Rapid Eye Movement.
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During deeper sleep stages, particularly stages 3 and 4 of non-REM sleep, brain activity slows down significantly, resulting in the predominance of delta waves, which are characterized by their high amplitude and low frequency. This phase is crucial for physical restoration, memory consolidation, and overall health. As sleep progresses, the duration of these deeper stages tends to decrease in favor of lighter sleep and REM sleep as the night continues. Disruptions in these deeper stages can lead to feelings of fatigue and impaired cognitive function upon waking.
.Many people in their 60s and 70s experience less time in the stages of deep sleep known as delta sleep. Despite this change, many healthy older people don't experience sleep disorders. Overall health plays a role in.trouble sleeping.
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There is alpha or stage one sleep, theta or stage two sleep, delta or statge 3 sleep, and alpha with REM (stage 4 sleep).
Sleep stages are defined in terms of brainwave patterns, which can be measured by an electroencephalograph (EEG).
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