Well, that or there should be more work.
Basically, there isn't enough to do in the world at 4:00 a.m.
I suppose if I lived in NY (the city that never sleeps) I'd find things to do. I've taken to watching Insomniac with Dave Attell on Comedy Central for ideas of things to do in the wee hours. So far, it seems that drinking is a popular activity; no help there.