U1T4 Sleep 1 (Psychology)

The number of brainwaves per second.

The biological process of alternating between sleep and wakefulness.

Neurotransmitter involved in regulating arousal. Helps keep us alert during the day.

One of two phases of sleep, characterised by rapid eye movement

A hormone that causes sleepiness and is released when it is dark. Secreted from the pineal gland.

Small part of the hypothalamus that controls circadian rhythms in response to external stimuli.

Theory that states that sleep serves an animal's chance of survival in its environment.

A device that detects, amplifies and records the electrical activity of muscles.

A circadian phase disorder that delays sleep patterns, often seen in adolescents.

A sleep disorder that causes sudden and unexpected sleeping.

Biological rhythms that occur approximately once every 24 hours (e.g. sleep-wake cycle, body temperature).

A sleep disorder characterised by difficulties falling asleep, staying asleep or waking up at the right time.

One of two phases of sleep, characterised by little or no rapid eye movement.

Theory stating that sleep allows us to recharge our bodies, and recover from physical/psychological work during the day.

Periodic bursts of rapid frequency brainwaves.