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Having poor sleep quality disrupts the sleep cycle and the transitions between the various stages of sleep.

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An example of this is jet lag, where the body's circadian rhythm is affected due to rapid long-distance travel, which results in the traveler being maladjusted to the local time. The ability to react to stimuli is one of the distinguishing factors between the states of sleep and wakefulness. Use this calculator to compute what time to go to bed or get up to wake up refreshed between sleep cycles. Deprivation of REM sleep can result in anxiety, irritability, hallucinations, and difficulty concentrating.Studies have shown that when the body is deprived of REM sleep, subsequent sleep will involve the body increasing the number of attempts to go into REM sleep, as well as increases in the amount of time spent in REM sleep compared to periods of no sleep deprivation. As a person ages, they tend to sleep less, with newborns sleeping for significantly longer hours than adults. The circadian clock exhibits a regular rhythm that corresponds to outside signals (such as night/day) that can persist even if the outside signals suddenly disappear.

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Sleep is far from perfectly understood, and the amount of sleep a person needs can vary largely based on certain metrics, such as age, as well as entirely individually. Ideally, a person's sleep cycle follows the circadian clock, but sleep can be affected by numerous factors such as light, social timing (when others are awake, when work is required, etc. When counting, please deduct the time taken to fall asleep, which can be very different for different people. This is referred to as a REM rebound, and is consistent with the belief that REM sleep is necessary for the body. During sleep, the brain expends significantly less energy than it does when a person is awake, particularly during non-REM (rapid eye movement) sleep.Ideally, the timing of sleep must be balanced such that the maximum concentration of the hormone melatonin and the minimum core body temperature occur after the middle of the sleep episode, and before awakening.