Professional insomniac here. AKA ThirdShifter. But I'm naturally a non sleeper. I don't know what its like to be to feel tired. I have two states. Lucid and exhausted. Its like never feeling hungry, just full or starved. It makes it hard to keep a regular sleeping pattern. I often have to make myself go to bed otherwise I'll screw up an entire week.
Hell yesturday morning I had to take a sleeping pill cause I felt fine after being up for 26 hours. I figured if I didn't I would just stay up watching TV till the next shift and then I would be hurting.
And yes I have been diagnosed. I forgot what it was called (doesn't really matter) but its difficulting going to sleep and regulating sleep patterns. Theres anotehr form that I think would be more irritating. Which is having trouble staying asleep.
BTW anyone have those really annoying nights were your sure you staid up all night but your not sure. I get those all the time and I'm positive that I'm dreaming about watching the clock all night.