What is happening?

So I have been getting really bad inches on my legs. Not bite like this. it like a lot of spots on my legs start itching at the same time. it only happens when I'm in my bed. my bed covers arnt dirty I change them every week and I don't get into bed in outside cloths what's wrong why are my legs itching. I don't know what to do its driving me crazy and my legs are all itched up. its almost spring and summer and if I don't stop itching I won't be able to wear skirts and dresses in the summer 😩😞
What is happening?
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