I have been having this problem with sleep since last two-three weeks. Instead of sleep disorder, may be disorderly sleep is a better way to put it. I have been falling asleep wherever and whenever! Ten days ago, I was returning back home from work in office bus and slept off somewhere on the way. I overslept, and when I woke up I was already two stops ahead of where I was supposed to get down! If I am at home on a weekend afternoon, invariably I end up in a deep slumber. It happened last week and the week before that. Besides that, I have been having a hard time waking up in the morning and been reaching office late everyday. My system is also very slow and I see myself gaining some activity only as late as 3pm in the day! All this, not out of sleep deprivation in the night - I manage to sleep pretty well. It feels as if I have been drugged. I haven't had this problem a month ago and has suddenly started to be this way. I am the kind of guy who would rather be up 24 hours in the day and keep doing something, and this is really irritating. Hope this passes soon..