Make The Bed? Bollocks!

Can someone please explain to me why we bother to make the bed?
As far as I can tell, there is no logical reason why the missus forces me to do it. I mean, in a few hours you're gonna climb back in and mess it up again anyway. And don't tell me it's to make the room look nice, you might as well shut the bedroom door and not bother.
From now on, when the missus tells me to make the bed, I'm just gonna get into it and go to sleep.