Mac Forums

I was wondering if it is bad to leave my computer on all night. I watch my dvds or movies and i usually fall asleep and now i got used to sleeping with background noise.. Will it do any kind of damage to my computer or will it burn anything.. basically is it good or bad? if it is bad can you please tell me what is bad about it?? and if there is anyway i can make it automatically go to sleep of turn it off like some t.v's are capable of doing?