My legs hurts after falling asleep?

Bluebirds
Hi.
For some while my legs have started to hurt after they ''wake up'' after sleep? It's hard to explain - but it's not a extreme pain, but it does hurt so much, that I find it quite hard to walk, and out weight on it.
Sometimes I really struggle with lifting my legs, both or just one - it feels like I have weights around my ankles. I'm only seventeen.

Have anybody else experienced this?
My legs hurts after falling asleep?
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