I have always had sleeping schedules that were out of the ordinary (assuming that a single period of 6-9 hours sleep at night is considered “ordinary”). Since retiring five years ago, and thus not having to meet any kind of official schedule, I have expanded the oddity of my sleep.
My basic sleep pattern these days is to go to bed around 11pm and wake about 3am; return to bed about 5am and sleep until 7 or 8am; then have a two hour nap in the afternoon, usually from about 3-5pm. That gets me about eight hours of segmented sleep each day. None of my sleep or wake times is mediated by alarm clock or other device; it is all natural.
During that middle-of-the-night waking period, I often seem to get a lot of basic work done — collating, filing, researching, scheduling — that I tend not to do in the daylight. That organizational work allows me to get straight into action-oriented stuff first thing in the morning. Sometimes, I just spend the night time playing backgammon or watching sports. In those cases the great benefit of having been up is simply the tactile pleasure of getting back into a warm cozy bed and snuggling down again.
I assumed that my sleep pattern was unusual. Imagine my surprise, therefore, to discover today there is something called the Polyphasic Society that promotes multiple periods of sleep each day. According to their definition, I seem to be practising Dual Core Sleep.
I can sleep a lot better now knowing that I have a whole Society behind me.