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Example hypnogram of a normal, healthy adult Here, both stage 3 and stage 4 are shown; these are often combined as stage 3. A hypnogram is a form of polysomnography; it is a graph that represents the stages of sleep as a function of time.
Sleep cycle. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [ 1]
Sleep. Sleeping Girl, Domenico Fetti, c. 1615. Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment.
Rapid eye movement sleep ( REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. The REM phase is also known as paradoxical sleep ( PS) and sometimes ...
Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
Here, sleep doctors explain what’s normal and what isn’t. Plus, they give tips on what to do when it happens and you’re struggling to fall back asleep. Related: Sleep Experts Agree That This ...
Hypnogram showing sleep architecture from midnight to 6:30 am, with deep sleep early on. There is more REM (marked red) before waking. (Current hypnograms reflect the recent decision to combine NREM stages 3 and 4 into a single stage 3.) Understanding the activity of different parts of the brain during sleep can give a clue to the functions of ...
Even a few ounces of alcohol changes the basic structure of normal sleep. Having a drink to help you fall asleep is an ineffective sleep strategy that can lead to a multitude of sleep disturbances ...