I, for one, am a huge fan of sleep. I miss a lot of sleep during the week, so I often sleep 12-14 hours each night on the weekends. But it's true, when you wake up at 2:00 in the afternoon, that the wasted potential of that time really hits home.

I once had a friend who stayed up for five days straight. He ended up writing a 3-page email to my best friend/roommate confessing his love for her... despite knowing she had no interest in him romantically. Despite having just forcefully coached her into breaking up with her boyfriend (definitely a plus, but still, rather self-serving). They didn't speak for years. Very awkward.