scratching myself awake again

this happened again last night. i woke up already scratching my arm before i was even fully awake, and i think i broke skin a little before i even noticed. i’ve been wondering if it’s a laundry thing, i switched detergent a while back and never actually checked if that’s the cause, or if it’s just how i sleep now. does anyone wear something on their hands at night, or is that overkill? and how do you know when it’s time to stop guessing on your own and just get a dermatologist to actually look at it?