psych 1.5-1.6 (sleep waves and brain stuff)

Alpha waves

the relatively slow brain waves of a relaxed, awake state.

Delta waves

the large, slow brain waves associated with deep sleep.

Hallucinations

false sensory experiences, such as seeing something in the absence of external visual stimuli.  

Hypnagogic sensations

bizarre experiences, such as jerking or a feeling of falling or floating weightlessly, while transitioning to sleep. (Also called hypnic sensations.)What are waves like when you’re sleeping

What are waves like when you’re sleeping

• Slow, relaxed alpha waves are present on the EEG right before we fall asleep. 

• By the moment sleep occurs, breathing has slowed, and irregular waves appear on the EEG.

Suprachiasmatic nucleus (SCN)

a pair of cell clusters in the hypothalamus that controls circadian rhythm. In response to light, the SCN adjusts melatonin production, thus modifying our feelings of sleepiness.