Well you can only dream if you get to REM (Rapid Eye Movement) sleep.
I remember reading about a disorder where something happens in your brain where a chemical is released and you don't feel tired. Only downside to this disorder is that after a short while of having it untreated you will die.
Says every medical fact show I've ever seen and my doctor after he had me do a sleep study for sleep apnea. I never said they were right, just stating what I had been told, which was that you can't dream if you don't enter REM sleep.
I remember i would play so much basketball just when i went to sleep i would suddenly duck a fast moving basketball, I lived on a small boat at the time I to others it looked like I would randomly headbutt the bulkhead at lighting speed for no reason.