Sleep

Question 1

Circadian Rhythm

Answer 1

Our body’s biological clock that roughly synchronize the 24-hour cycle of day and night.

Question 2

REM Sleep (Rapid Eye Movement)

Answer 2

The periods of fast, jerky eye movements were accompanied by energetic brain activity. Awakened during such episode, a person would report having a dream.

Question 3

Hallucination

Answer 3

Sensory experiences that occur without a sensory stimulus.

Question 4

Hypnagogic Sensations

Answer 4

Bizarre experiences, such as jerking or a feeling of falling or floating weightlessly, while transitioning to sleep.

Question 5

NREM Sleep (Non–Rapid Eye Movement)

Answer 5

Is, collectively, sleep stages 1–3, previously known as stages 1–4. Rapid eye movement sleep is not included.