security
you wanted the door open so that you could call out to your parents if you needed them during the night.
in your own home, you feel more secure with the door closed, because it seals your bedroom.
( Smash Monkey lowering the tone of the whole internet, Sat 17 Dec 2011, 15:15, 2 replies)

This, pretty much.
Growing up, huh?
( monster munch person, man, woman... camera... TV?, Sat 17 Dec 2011, 19:15, closed)

^this

( FeralCatMan Unusual disease collector., Sat 17 Dec 2011, 21:16, closed)