See also dream insomnia narcolepsy sleep apnea. There is evidence that the hypothalamus and thalamus of the brain initiate sleep and that part of the midbrain acts as an arousal system. REM sleep is also believed to integrate new information in the brain and to reactivate the sleeping brain without waking the sleeper. It has been hypothesized that while deeper stages of sleep are physically restorative, REM sleep is psychically restorative. The amount of sleep needed depends on both the individual and the environment: For instance, worrying, critical individuals tend to need both more sleep and more dream sleep than easygoing ones, and stress and worry during the day result in an increase in REM sleep. There is some evidence that emotional and environmental deprivation disrupts the sleep patterns of young children, which in turn inhibits the secretion of growth hormone, normally secreted maximally during sleep. Dream deprivation or sleep deprivation results in detrimental changes in personality, perceptual processes, and intellectual functioning. Rapid-eye-movement (REM) sleep occurs during Stage 1 sleep at the end of each cycle, and people woken up at this time usually report that they have been dreaming. Stage 3 signals an increase of low-frequency, high-amplitude delta waves, and at Stage 4 sleep these delta waves account for more than half of all brain wave activity (see electroencephalography). The stage usually lasts only several minutes, before the individual drifts into Stage 2 sleep, and the brain moves into low-frequency, high-amplitude waves. In the first stage, low-frequency, low-amplitude theta waves characterize brain activity. In humans, sleep occurs in cyclical patterns in each cycle of 11-2 to 2 hr, the sleeper moves through four stages of sleep, from Stage 1 to Stage 4, and back again to Stage 1. Sleep also aids in the strengthening of memories, and researchers have discovered that an increased circulation of fluids in the brain during sleep removes waste products from the brain. However, sleep is also a time of repair and growth, and some tissues, e.g., epithelium, proliferate more rapidly during sleep. During sleep, which is in part a period of rest and relaxation, most physiological functions such as body temperature, blood pressure, and rate of breathing and heartbeat decrease. Similar to the meaning of Sleepless, you can check other words' meanings as well by searching it online.Sleep, resting state in which an individual becomes relatively quiescent and relatively unaware of the environment. This English to Urdu dictionary online is easy to use and carry in your pocket. Dictionary is a helpful tool for everyone who wants to learn a new word or wants to find the meaning. It can be used in various sentences and Sleepless word synonyms are also given on this page. However the meaning of Sleepless stated above is reliable and authentic. There is more than 1 meaning of each word. You can use this amazing English to Urdu dictionary online to check the meaning of other words too as the word Sleepless meaning.įinding the exact meaning of any word online is a little tricky. Sleepless word meaning in English is well described here in English as well as in Urdu. Sleepless word is driven by the English language. Sleepless meaning in Urdu is a بے خواب - Bay khawab.
Sleepless is an English word that is used in many sentences in different contexts.
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