This is what a lack of sleep + a messed up sleep schedule can do to you:

I was doing homework at my computer a few nights ago, but decided to stop and sleep since I had to wake up in four hours.

After falling asleep I dreamt that I was at the house of a old friend of mine, doing homework in his room. I nodded off while doing so, and dreamt something short that I can't recall. I then woke back up and asked him how long I had fallen asleep for. He replied "only for 5 seconds or so," to which I replied "oh."

I thought for a bit and then asked him if I was dreaming, and he said I wasn't. I accepted it, but then thought for a bit and said "I must be, otherwise I wouldn't be at your house."

I then made an effort to wake up, and did so. When I woke up it felt as if I hadn't even been asleep.