Rapid Eye Movement (REM)

Rapid eye movement (REM) is the stage of sleep characterized by rapid saccadic movements of the eyes.

During this stage, the activity of the brain’s neurons is quite similar to that during waking hours.

Most of the vividly recalled dreams occur during REM sleep.

It is the lightest form of sleep, and people awakened during REM usually feel alert and refreshed..

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Circadian rhythm sleep disorder

People with circadian rhythm sleep disorders are unable to sleep and wake at the times required for normal work, school, and social needs.

They are generally able to get enough sleep if allowed to sleep and wake at the times dictated by their body clocks.

Unless they have another sleep disorder, their sleep is of normal quality.

Humans have biological rhythms, known as circadian rhythms, which are controlled by a biological clock and work on a daily time scale.

Due to the circadian clock, sleepiness does not continuously increase as time passes.

Instead, the drive for sleep follows a cycle, and the body is ready for sleep and for wakefulness at different times of the day..

For more information about the topic Circadian rhythm sleep disorder, read the full article at Wikipedia.org.

Delayed sleep phase syndrome

People with DSPS tend to fall asleep at very late times, and also have difficulty waking up in time for school or work which begins in the morning.

Often, DSP individuals report that they cannot sleep until early morning.

Unlike insomniacs, however, they fall asleep at about the same time every night, no matter what time they go to bed.

People with DSPS have at least a normal – and often much greater than normal – ability to sleep during the morning, and sometimes in the afternoon as well.

In contrast, those with chronic insomnia do not find it much easier to sleep during the morning than at night..

For more information about the topic Delayed sleep phase syndrome, read the full article at Wikipedia.org,

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