Deep sleep refers to the Stage 4 - slow-wave sleep; the deepest form of normal sleep.

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Sleep at psychology-glossary.com■■
Sleep is a physical and mental resting state in which a person becomes relatively inactive and unaware . . . Read More
Central Core (Brain) at psychology-glossary.com■■
The Central Core (Brain) is found in all vertebrates; - - Its five main regions help regulate basic . . . Read More
Deep sleep at psychology-glossary.com■■
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Delta sleep at psychology-glossary.com■■
Delta sleep refers to slow wave sleep, stages 3 and 4 of NREM sleep . . . Read More
Somnambulism at psychology-glossary.com■■
Somnambulism refers to sleepwalking. ; - It is the purposeful moving, usually but not always including . . . Read More
Rapid eye movement sleep at psychology-glossary.com■■
Rapid eye movement sleep also known as REM is a stage of sleep that accounts for approximately two (2) . . . Read More
Light/Deep sleep at psychology-glossary.com■■
Light/Deep sleep refers to a stage of sleep which is described below: ; - ; - Your brain waves move fast . . . Read More
Non-rapid eye movement sleep at psychology-glossary.com■■
Non-rapid eye movement sleep (NonREM, NREM) refers to a type of sleep that is divided into four (4) stages. . . . Read More
Non-REM sleep at psychology-glossary.com■■
Non-REM sleep (NonREM sleep or just NREM) which is another name for Non-rapid eye movement sleep refers . . . Read More
Hypnagogic sleep at psychology-glossary.com■■
: - Hypnagogic sleep refers to a stage of sleep which is neither dreaming nor - daydreaming. The Hypnagogic . . . Read More