How does Marijuana disrupt your sleep?

THC can disrupt normal sleep by suppressing REM sleep, so sleep may be less natural and restorative even if it helps you fall asleep faster.

1. Faster sleep onset, but not natural sleep: THC may help you fall asleep sooner, but the brainwave pattern differs from natural sleep. 1
2. REM suppression and rebound dreams: THC appears to block REM sleep; people may remember fewer dreams while using it. After stopping, the accumulated REM pressure can produce a REM rebound with unusually vivid, intense dreams. 2