Originally Posted by
Schmedlap
This is, admittedly, anecdotal, but my experience was that our routines were necessarily so random that it was impossible to develop a rhythm. Most of the time, when I stepped outside of the windowless CP of our patrol base, I wasn't sure whether to expect to see daylight or darkness unless I had just checked my watch. I've also never been awake for two days and then thought, "gee I should get some sleep, but who can fall asleep while the sun's up?"
I get what you're saying, but I'm not sure it's applicable in an environment where schedules are so erratic.