Late-night productivity

So last night I got less than 7 hours of sleep, which would normally make me really cranky, lethargic, and unproductive.  But, lo and behold, I've been relatively normal today, and (look at the timestamp) I'm actually productively reading scientific articles and filling out forms for EGSC social events all the way until midnight without feeling tired.  Maybe this will backfire, but I think I'm going to try getting less sleep (6.5 hrs) and see what happens.