help help help!

Okay, a few days ago i was sleeping and i started having dream. it was about my brother. cause the days before that (and now still) he was bugging the crap out of me!!

but yeah, in the dream we went outside and snow was on the ground. he got into a toy car (like the ones you get at Wal-Mart, they look real but are for little kids) and he started riding around. well, in our yard there was a little pond. another car drove over it, cause it was frozen, and it didnt fall in an area where it was still water. so my brother did it and he went right in. i then ran over to him and said "Grab my hand!" but he just sat there looking at me, while he was sinking with the car. then he went under and i said "I am coming!" and i dived in. i was trying to grab him, but i ran out of breath and started swimming back up. before i swam back up he was looking at me, no emotion, just looking at me, and he didnt even try to swim! so he sunk and i am guessing he died.

then when i got out of the pond or whatever, i woke up.my heart was beating like crazy and then i just went back to sleep.

does anyone know what that dream meant??