sleeping for a few hours, waking for a couple more, then sleeping again used to be quite common a few centuries ago. People would just visit the neighbours, have sex, read the Bible, whatever, then go back to bed when they were tired again
"What would our sleeping patterns be in the sort of ideal sense? Well, it turns out that when people are living without any sort of artificial light at all, they sleep twice every night. They go to bed around 8:00 p.m. until midnight and then again, they sleep from about 2:00 a.m. until sunrise. And in-between, they have a couple of hours of sort of meditative quiet in bed. And during this time, there's a surge of prolactin, the likes of which a modern day never sees. The people in these studies report feeling so awake during the daytime, that they realize they're experiencing true wakefulness for the first time in their lives."
http://www.ted.com/talks/jessa_gamble_how_to_sleep/transcript?language=en
The talk's here
http://www.ted.com/talks/jessa_gamble_how_to_sleep
Apparently one of the things is that if you think of it as normal rather than as an affliction, it all becomes less stressful - and you sleep better..