I have some itch problems at night?

Ok so every time I try to sleep I can't because my legs start to get itchy. Also my back. When it gets around 3 in the morning I feel a lot of itchy bumps like some type of bug has pinched me or something. Its been going on for about 2 weeks now, and it went away for 2 days then it came back and then it went away and I thought that since I have KP that was the case but I don't really know what it is. It used to be at the side of my legs but now sometimes way smaller bumps have developed on my lower legs and have spread on my arms, but those are not noticeable. Also when I take a shower it goes away but then when I try it comes back. I really need help thank you.