Understanding Morning Wood and Sleep Cycles

The video explains the phenomenon of morning wood, a normal part of the sleep cycle that occurs due to changes in blood flow during REM sleep. Norepinephrine, a chemical that usually constricts blood vessels, is turned off during REM sleep, allowing for increased blood flow and oxygenation to tissues. This process happens multiple times a night, and we often wake up during REM sleep, which is why morning wood is commonly noticed upon waking.

What is 'morning wood' a normal part of?

• The respiratory cycle

• The sleep cycle

• The digestive cycle

• The exercise cycle

How many times does 'morning wood' typically occur during the night?

• Ten times

• Four or five times

• Twice

• Once

What happens to norepinephrine during REM sleep?

• It remains constant

• It is turned off

• It decreases

• It increases

What effect does the absence of norepinephrine have during REM sleep?

• Increases blood flow

• Decreases blood flow

• Causes sleep paralysis

• Stops dreaming

Why are people more likely to wake up during REM sleep?

• Because it is the lightest sleep stage

• Because it is the longest sleep stage

• Because it is the shortest sleep stage

• Because it is the deepest sleep stage

What is the main reason people experience 'morning wood' upon waking?

• Due to waking up from a dreamless sleep

• Due to waking up from a nap

• Due to waking up from non-REM sleep

• Due to waking up from REM sleep