Large 75 microvolt delta waves predominate the electroencephalogram. Predominates the first third of the night. ...

See also:

Slow Wave Sleep, Slow Wave Sleep - Electroencephalographic Characteristics, Slow Wave Sleep - Characteristics

Read more here: » Slow Wave Sleep: Encyclopedia II - Slow Wave Sleep - Electroencephalographic Characteristics

A delta wave is a large, slow brain wave associated with deep sleep. Delta waves are present only in stage-three sleep, stage-four sleep, cases of brain injury and coma. During sleep, delta waves are not present in the other stages (1, 2, and REM). See Slow Wave Sleep See also. Electroencephalography Theta wave Alpha wave SMR Beta wave Gamma wave ...

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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. REM sleep is so physiologically different from the other phases of sleep that ...

Including:

• Rapid eye movement - Physiology of REM sleep
• Rapid eye movement - Theories about the functions of REM sleep
• Rapid eye movement - REM sleep in other animals
• Rapid eye movement - History
• Rapid eye movement - Sources

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The function of REM sleep is not well understood; several theories have been advanced. According to one theory, certain memories are consolidated during REM sleep. Numerous studies have suggested that REM sleep is important for consolidation of procedural and spatial memories. (Slow Wave Sleep, part of non-REM sleep, appears to be important for declarative memories). However, in people that have no RE ...

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Rapid eye movement, Rapid eye movement - Physiology of REM sleep, Rapid eye movement - Theories about the functions of REM sleep, Rapid eye movement - REM sleep in other animals, Rapid eye movement - History, Rapid eye movement - Sources

Read more here: » Rapid eye movement: Encyclopedia II - Rapid eye movement - Theories about the functions of REM sleep

Physiologically, certain neurons in the brain stem, known as REM sleep-on cells (located in the pontine tegmentum), are particularly active during REM sleep, and are probably responsible for its occurrence. The release of certain neurotransmitters, the monoamines (norepinephrine, serotonin and histamine), is completely shut down during REM. This causes REM atonia, a state in which the motor neurons are not stimulated and thus the body's muscles don't move. The lack of REM atonia causes REM Behavior Disord ...

See also:

Rapid eye movement, Rapid eye movement - Physiology of REM sleep, Rapid eye movement - Theories about the functions of REM sleep, Rapid eye movement - REM sleep in other animals, Rapid eye movement - History, Rapid eye movement - Sources

Read more here: » Rapid eye movement: Encyclopedia II - Rapid eye movement - Physiology of REM sleep