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Rapid eye movement sleep. 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 ...
Microsleep. A microsleep is a sudden temporary episode of sleep or drowsiness which may last for a few seconds where an individual fails to respond to some arbitrary sensory input and becomes unconscious. [1] [2] Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without ...
Closed-eye hallucinations and closed-eye visualizations ( CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.
Dehydration also reduces blood flow and magnifies cardiac problems, Jay said. Attacking the brain. Heat also affects the brain. It can cause a person to have confusion, or trouble thinking ...
While you can catch up from a night or two of poor sleep by resuming your routine for the next few nights, Atwood says, chronic sleep deprivation, lasting for months or years, can lead to "lasting ...
Lagophthalmos. Lagophthalmos is the inability to close the eyelids completely. [1] Blinking covers the eye with a thin layer of tear fluid, thereby promoting a moist environment necessary for the cells of the exterior part of the eye. The tears also flush out foreign bodies and wash them away.
Bright rooms are a relatively recent invention, and though you can read or watch TV for longer, the real concern for close-sitters and dark-watchers is added eye strain. Eye strain is a natural ...
Sleep in fish. Sleep can be defined in birds and mammals by eye closure and typical electrical patterns in the neocortex, but fish lack eyelids and a neocortex. Yet this oscar is behaviorally quiescent at night, lying unresponsive on the bottom with its eyes turned downward, and might be said to sleep. [1]