Īnother key function of Deep sleep is memory consolidation. These activities are facilitated by g rowth hormone, which, is secreted during Deep sleep – not a coincidence. In addition, glial cells, the major cell type of the nervous system are also restored during this stage to provide energy for the brain. It’s also noteworthy that food proteins ingested during the day are synthesized into complex proteins of living tissue to allow for the healing of muscles as well as all bodily tissues during delta sleep. This suggests that Deep sleep is more important than the other stages of sleep, as it returns immediately in greater quantity. Only 14% of light sleep is regained after sleep deprivation, but 68 % of Deep sleep and 53 % of REM sleep are regained. When sleep-deprived humans return to normal sleep, the recovery percentage for each stage of sleep is not the same. Sleep deprivation studies also demonstrate that the primary function of Deep sleep is to allow the body and brain to recover from da ytime activities. All of these factors indicate a more restful state is being induced in the brain regions that need them most and that this rest occurs during Deep sleep. The regions of the brain that are most active when awake have the highest level of deep or slow waves during slow-wave sleep, as they need the greatest rest. The activity falls to about 75 percent of the level found in wakefulness. During this stage of sleep, there is a significant dec reas e in cerebral functioning and metabolic rate and a drop in cerebral blood flow. It appears that the brain is no different and that the rest it requires, occurs during Deep sleep. However, a number of medical studies, demonstrate that this is not an uncommon finding by mid-life.Īfter we exercise our muscles need to rest. Young adults typically spend 20% to 25% of their sleep in this stage, while the elderly’s Deep sleep drops to about 3% by age 75. In addition, c hildren and young adults will have more total Deep sleep per night than older adults. Longer periods of D eep sleep occur in the first part of the night, and Delta sleep waves are present primarily in the first two sleep cycles. Deep sleep (also known as slow wave sleep or Delta sleep) is recognized by EEG activity with high voltage (75 µ V) waves with a frequency range typically between.
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