Sleep deprivation
 

Can it cause you to hear and see funny things?

Yes. It's called Hallucination.

Smoke some mushrooms.

when i stay up whole night and don't feel like going to sleep the next morning i always hear soccer-stadium-people-yelling instead of the sound that a car makes when it passes by a few meters away

Okay. Cause last night i heard something on my tv outside my room, even though it was off, sounded like a woman constantly yellin the same thing over and over and over again!

I stayed up for about 36 or so hours once while having a horrible night shift to day shift switch at work. On the bike ride home from work shadows jumped at me, cars drove on the sidewalks even though there wasn't any cars on the whole trip...oh and I listened to music on my flat MP3 player.

I stopped half way home and almost died from shock as I saw the curve of the Earth and my bike start going without me. Of course once I blinked it all came back to normal. Once I worked out that I was really tired and this was all in my head it sorta stopped, how I didn't have it happen while at work shocks me when I think about it.

Whats worse is that I used stay up that long and not even care..old age for ya (I was 21).

Fubb, sleep deprivation can cause a lot of detrimental effects. Hallucinations are the least of those - you should be more worried about the possibility of a heart attacks or a stroke.

I have to admit that I had those "shadows dance in front of your car" "hallucination" once or twice. :D

That was when I was working night shifts and could not get any sleep during the day, though. And only on the trip back home, before I crashed to bed.

Sleep deprivation- Can it cause you to hear and see funny things?
difficult question

"Sleep: can it cause you to hear and see funny things?"
easy answer!

Depends when you are dreaming. When sleeping in you're dreams you see pink elephants and hear voices of persons from long time ago, probably. When somebody or something suddenly shakes you or wakes you up in the middle of the night during a dream-phase, those remains of dreams can appear as "voices" during day when nobody is around, it does surely seem funny.

But it's not funny at all, it means your subconsciousness was interrupted doing self-repairs and you are not ok afterwards. Doctor says, immediately make sure you u got enough fresh air, a warm place and lay down for a catnap.