Sleep, usually. Of course, that's not an option right now, I pulled an all-nighter in the hope of resyncing my sleeping pattern so I need to stay up until at least 10pm otherwise it'll be pointless. Of course, I'm bored out of my mind right now and don't have the energy or inclination to do anything that would require brainpower and I'll fall asleep if I try to read or watch a DVD. So instead I'm browsing forums and idly clicking the 'Stumble' button on my StumbleUpon toolbar. Oh, hey, I guess that's an idea. You could do that. But yeah, normally my answer would be to sleep.
/me has lost all ability to form a coherent sentence