![]() ![]() REM sleep is noted to be the highest during infancy and early childhood, after which it begins to decline during adolescence and young adulthood and further declines even more as you grow old. In your lifetime, the amount of REM sleep often changes as you age. Your first REM sleep is short of about 10 minutes and as the night sleep progresses you will have longer REM sleep and shorter deep sleep. you may have vivid dreams during REM sleep.heart rate increases and breathing may become faster as the brain activity increases.the major muscles that are normally controlled are unable to move and you may even feel as if they are temporarily paralyzed.there is rapid eye movement from side to side.Following the stage of deep sleep, the stages of sleep reverse to a different state, and the EEG recordings in REM sleep are similar to that of the awake state.4 This means that soon after deep sleep you enter the REM sleep in which your brain activity again increases and the sleep is not as deep. ![]() ![]() REM Sleep – This is a stage of rapid eye movement or REM sleep. 6Įxperts have also found that when deep sleep was suppressed for three consecutive nights, the insulin sensitivity decreased, thus reducing glucose tolerance and increasing the risk of diabetes. Studies have reported that the growth hormone levels increased significantly during the deep sleep stage as compared to stages 1 and 2 and REM sleep. This may have an impact on the circadian rhythm, sleep-related hormones, and overall health of the aging population. Studies have shown that sleep efficiency, sleep time, and deep sleep decrease with aging, and the number of awakenings at night and time spent staying awake at night increase. It promotes the secretion of certain hormones that are required for physical and mental well-being. The deep sleep stage is the most important as it promotes healing, repair, and growth. With aging, some people may spend less time in the deep sleep stage than younger people. Sleepwalking, night terrors, and bedwetting may also occur during the deep sleep stage. Studies have shown that when people are awakened during this stage, they may have impaired mental performance for 30 minutes to an hour. If you are made to wake up during this stage you may experience mental fogginess or sleep inertia, which can make you feel disoriented for some time after waking up. Some people may not be able to wake up even in the presence of loud noises. This is commonly called deep sleep, from which it is difficult to wake up someone. There is no eye movement or muscle activity. Stage 3 (N3) Deep Sleep – This is the deepest sleep stage, during which delta waves of lower frequency of about 1 to 4 Hz and higher amplitude are produced. It lasts for about 25 minutes during the first cycle and its duration increases in the successive cycles, such that it comprises about 45% of your sleep. Teeth grinding may occur during this stage. This sleep stage is one of the deeper states with long delta waves and helps maintain sleep and memory function. Sleep spindles are periodic bursts of activity of about 10 to 12 Hz that may last for 1 or 2 seconds. As the increase in the amplitude with high-frequency spike clusters is noted, often termed sleep spindles may be noted. Brain waves slow down as there is a further decrease in the frequency of EEG waves. This stage prepares your body to enter the deepest sleep. In this, stage of light sleep there are periods of muscle partially contracting and relaxing. Stage 2 (N2) – During this stage, your heart rate further slows and body temperature further decreases. This stage lasts for about five minutes and comprises about 5% of total sleep time. The frequency begins to reduce and the amplitude of the cortical waves begins to slightly increase. If you wake up from this stage, you may feel as if you haven’t slept at all. Your muscles begin to relax with some twitches. Your body functions like respiration, muscle activity, eye movements, and heartbeat begin to slow down. Stage 1 (N1) – A part of NREM, is a drowsy period when you begin to move from the awake state towards falling asleep. Let us look at the variations in each sleep stage that also explains REM sleep vs deep sleep. Following this, the phase of NREM and REM alternate every 60 to 90 minutes throughout the rest of the night. During a night sleep, the sleep process is cyclical and with the onset of sleep, there is a rapid descent to the deep sleep stage (N3) within the first hour. ![]() You spend 75% of your sleep in the NREM stages, which include the deep sleep stage. As the NREM sleep progresses into the next stage, you move into a progressively deeper sleep. ![]()
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