Less sleep and resulting leg pain. Be.

I've this weird association that whenever I sleep less, I've pain in my legs and sometimes in hands(but mostly in legs). However, It is not ordinary joint pain or in bone. I can describe it as closer to burning sensation. It's something I never feel otherwise. So from past 1 year, each time I sleep 4 or 5 hours. There's this pain. If I sleep 2hrs, pain is too much, for 3, lesser, for 4 even lesser and so on. So, on such a day when I've slept less and have this pain, I go back to sleep to reduce it, the more I sleep, the more it is compensated. If I sleep 1 hr it's compensated less, if 2 hrs,it's compensated more and so on. The pain only goes when the sum of my both sleep periods is 7 hours. Please tell me what can this be..