Bed mites are very common you could be allergic to their bites. Try seeing your doctor. And get allergen free bed and pillow covers.
What Are Bumps That Look Like Mosquito Bites, Itch Like Crazy And Seem To Disappear And Reappear On Someone Else?
Most probably, you are infected by scabies. This parasite is contagious and live on skin by making superficial burrows. It requires treatment for all members of a house whether infected or not. Washing of affected bed sheets and night dresses before reuse. So, visit to a dermatologist and get proper diagnosis and treatment.
My first thoughts are fleas and chiggers.