Why do my nose and lips get bigger when I wake up?

Usually when I wake up in the morning, my nose and lips get bigger. My lips are normally kinda big, so they are only a little bit bigger in the morning. But my nose is normally small, but when I wake up its all round and big and just, uh, gross and not normal. Why is this? Is it my sleeping position? How do I keep it from happening?

the same thing happens to me..
I asked my friends mom [[whos a doctor]] and she said that..while your sleepin..pressure builds up in your nose and mouth..makin them swell a little bit. this happens to everyone. once your standin and walkin around..the pressure should start to realise slowly. but the swellin should go down within 1-2 minutes. also..going to bed on your stomach or your bakk is the best way to not build up the pressure as fast..

=] =]

thanks a lot!