I've gotten locked into strange sleep cycles simply out of necessity (I am an undergraduate student at Carnegie Mellon). I've found that, while my body will accept a psuedo-equilibrium of somehow getting ~ 20 hours of sleep a week, it will almost always become unsustainable after 2 weeks... in which I'll need another day or two to recover. But after that (usually I take an entire week off, where I get at least 30 hours of sleep) I go back into my regular routine (note that I have a 105 minute sleep cycle, which is a little longer than most people's:
I'm curious: how did you figure out your sleep cycle that precisely (105 minutes)? I have been feeling like 90 minutes is not exactly right for me, but I haven't figured out a way to measure my sleep cycle.
M3:30 T0:20 W3:30 R0:20 F3:30 S7:00 U3:30