Ultradian rhythm refer to the 90-minute cycles of heightened and lowered brain Arousal observed throughout the wake/sleep c ycle.

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Circadian rhythm at psychology-glossary.com■■■■■■
Circadian rhythm refers to an internal biological clock that runs approximately on a 24 hour cycle. It . . . 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
NREM Sleep at psychology-glossary.com■■■■■
NREM Sleep is the abbreviations of Non-rapid eye movement sleep which is a type of sleep that is divided . . . 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 when . . . Read More
Theta rhythms at psychology-glossary.com■■■■
Theta rhythms refer to brain waves with a frequency of about 6 cycles per second. Humans do not produce . . . Read More
Pineal gland at psychology-glossary.com■■■■
Pineal gland refers to the gland in the brain that helps regulate body rhythms and sleep cycles. It is . . . Read More
Advanced Sleep Phase Syndrome at psychology-glossary.com■■■■
Advanced Sleep Phase Syndrome refers to a condition in which a patient wakes up too early in the morning . . . Read More
ASPS at psychology-glossary.com■■■■
Advanced Sleep Phase Syndrome (ASPS) is a sleep disorder characterized by an abnormal sleep pattern in . . . Read More
Advanced Sleep Phase Syndrome (ASPS) at psychology-glossary.com■■■■
Advanced Sleep Phase Syndrome (ASPS) refers to phases of the daily sleep/wake cycle are advanced with . . . Read More