There's also psychological, not just physical, implications to hacking in the lab til late: recently, I've been dreaming about the problems I've been working on

There's also psychological, not just physical, implications to hacking in the lab til late: recently, I've been dreaming about the problems I've been working on, and I think so hard about them in the dream that I wake up. :D As though the brain goes, "There isn't enough CPU for this; let's quit sleep mode so we can work on this with all cylinders." (Even if all I wanna do is sleep! Mentally pretending that I already fixed the problem seems to disarm things and lets me go back to sleep.)