Hmm ok I don't know whether it is a sleep disorder or what, but it's something I've noticed happening to me a lot recently.

Ok, what happens is this; some nights I'll hop in bed to go to sleep. I'll close my eyes an drift off, having a bit of HI as I go, sometimes even feeling a little lucid. I will sleep for half an hour then wake up. Sometimes after waking up I'll go take a slash and then fall asleep again, other times I won't be able to get to sleep again for hours. It doesn't sound that weird, but it happens ALL the time now... fall asleep for almost exactly 30 mins, wake up again. Even when I'm going to sleep at irregular times etc.

Does this happen to anyone else?