Why Our Brains Hallucinate As We Fall Asleep

What is the term for the weird state between being awake and falling asleep, where you might experience hallucinations?

• REM sleep

• Narcolepsy

• Hypnagogia

• Exploding Head Syndrome

What is it called when you see images of a repetitive activity, like playing a video game, flashing before your eyes as you fall asleep?

• Sleep paralysis

• The Tetris effect

• Lucid dreaming

• Hypnic jerk

As a person begins to fall asleep, how do their brain's electrical pulses, or brainwaves, change?

• They speed up from alpha to theta to delta waves.

• They slow down from alpha to theta to delta waves.

• They remain constant throughout the sleep transition.

• They shift from delta to theta to alpha waves.

What is a hypnic jerk, also known as a sleep start?

• A vivid dream that occurs during REM sleep.

• A sudden, involuntary muscle twitch as you fall asleep.

• Hearing a loud, exploding sound in your head.

• The feeling of floating or flying before sleep.