Not sure if this is necessarily a sleep disorder, but recently I've recently been having this strange problem sleeping that is preventing me from getting any decent rest on a regular basis.
Occasionally I will wake up after 2-3 hours of sleep and all of my major joints will seem to ache. It is worse in the back, knees, and neck/shoulders, but it is also noticeable in my wrists, elbows, fingers, etc. The pain is not too intense, but it is annoying enough to wake me and keep me from sleeping. It definitely feels like a "bone/joint ache" and not muscle tension. Taking 200-400mg of ibuprofen usually cleans it up after an hour or so. I have never experienced this kind of problem at any other time except when I had just been asleep.
At the same time, I will feel very flushed and have an itching sensation all over my body. I like sleeping cold and so my room is set to 68F at night. Uncovering completely helps a little bit, but then I actually get cold even though my skin still feels hot. I also itch all over, but not all at once. One minute my arm will itch, the next my leg, the next my chest, etc.
I would also note that I am pretty jealous of my sleep. I have a Talalay latex mattress and memory foam topper. I sleep on 800 thread count Egyptian cotton sheets. I have a dust-mite cover and wash my sheets--and myself--pretty regularly. I say this to ward of explanations such as fleas, bed bugs, you live in a barn, etc. =P I also never have this sensation when I have been awake.
I've tried researching this a bit online, but have come up pretty empty. Any thoughts/ideas would be appreciated.