Unexplained Scratches

I've been getting these scratches for past couple months. Always in the same areas. My upper and lower back, stomach area and upper arm. I've researched and researched and can't come up with any answers. My diet has changed the past couple months, and I'm living with someone else (totally different environment) than my own, which is when my occurrences started. Going to start tracking my foods and keeping a journal to help with changes that maybe affecting what's going around me. Don't know what else to do. Next step will be visiting my doctor with my diary.

[CassCore]

Maybe you are scratching yourself in your sleep? Or your roommate is? Seems odd it started when you moved in with someone else...