It keeps happening

One night while I was sleeping, I randomly got itchy. Oh my torso, back and legs. Then it went away and I fell back to sleep. I woke up the next morning feeling fine no itchiness, nothing. I haven't changed my diet or living situation or anything. I thought hm maybe I ate something I wasn't supposed to. Every night since that first night, I get super itchy in the night time when I'm heading to bed. My SO said his brother gets really itchy at night time but he ignores it. It's really bothering me that this has been going on for some time. I have no bug bites just scratch marks because I can't help myself and it's causing skin damage. I do however get dry scalp and a dry face during the winter/ colder months but never my body. I had a dry patch on my lower back recently but that went away. I'm wondering if I'm allergic to my detergent? I did put more pods than normal in the load. Could that be it? Or mites? Or what? I'm not sure because I'm literally just itchy with no cause to go off on. Any advice?