Someone locked my iPhone overnight. I sleep alone.

This morning my iPhone showed the locked out after 10 attempts screen. I sleep alone, no pets inside the bedroom, and would like to think I’d hear if my roommate entered my room. First thought was someone was trying to hack into my phone, but my other 3 devices running on the same Apple account were as usual today. I wonder what the heck happened last night. Unfortunately these are old devices and I’m not able to use the Passcode feature, so I’ll wait.