Comedown

The trip wears off gradually after 8 to 12 hours, but you might continue to feel a bit messed up and weird until you get a full night's sleep. Physically, you can feel tired and drained right into the next day. Psychologically, any thoughts or feelings you had during your trip will stay with you. A positive experience can give you a kind of happiness lasting hours, days, or even weeks afterwards. A bad trip could freak you out for the same length of time.