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A microsleep is an episode of sleep which may last for a fraction of a second or up to thirty seconds.

Results from:


 * sleep deprivation
 * fatigue
 * depression
 * sleep apnea
 * hypoxia
 * narcolepsy
 * hypersomnia

Microsleeping can occur at any time and anyone, typically without significant warning usually when they are tired.

Microsleeps (or microsleep episodes) become extremely dangerous when occurring during situations which demand constant alertness, such as driving a motor vehicle or working with heavy machinery. People who experience microsleeps usually remain unaware of them, instead believing themselves to have been awake the whole time, or to have temporarily lost focus.

Symptoms
These are some signs of micro sleep are:


 * Increased blinking
 * Nodding head
 * Eyes trying to shut

Accidents
Microsleep can occur while driving an automobile when drowsy. The driver realizes that several seconds passes by while on the road which is all it takes for an accident to occur.

Many accidents and catastrophes have resulted from microsleep episodes in these circumstances. For example, a microsleep episode is claimed to have been one factor contributing to the Waterfall train disaster in 2003; the driver had a heart attack and the guard who should have reacted to the train's increasing speed is said by his defender to have microslept, thus causing him to be held unaccountable.

Theory
There is little agreement on how best to identify microsleep episodes. Some experts define microsleep according to behavioral criteria (head nods, drooping eyelids, etc.), while others rely on EEG markers. One study at the University of Iowa defined EEG-monitored microsleeps in driving simulation as "a 3–14 second episode during which 4–7 Hz (theta) activity replaced the waking 8–13 Hz (alpha) background rhythm."