Are These Sleep Hypo's?

I have been reading various posts and am wondering whether me waking up with my legs absolutely soaking might be night time hypos. My levels are usually the same as when I went to sleep though. If they Are them, what should I make of it and do? I do have Fibromialgia and M. E. And other health issues so cannot tell the real cause. Any help would be appreciated so thanks in advance. If they are Not them, I'm stumped.

I think I'm scared in case it happening while asleep is dangerous.