, Hallucinogens - ✔✔Drugs that alter moods, thoughts, and sense
perceptions including vision, hearing, smell, and touch. LSD and ketamine
Marijuana - ✔✔Sometimes grouped with hallucinogens but often goes without
a group
Sleep stage 1: light sleep - ✔✔Still conscious enough to respond to people.
Body prepares for sleep
Sleep stage 2 - ✔✔Obviously asleep, start to see bigger brain waves
Sleep stage 3 & 4 - ✔✔Big slow brain waves, very deeply asleep, when you're
the hardest to wake up
REM sleep - ✔✔Rapid eye movement sleep, a recurring sleep stage during
which vivid dreams commonly occur. Also known as paradoxical sleep
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