Random itching that causes no reddness, happens all over my body, extremely uncomfortable?

For the past year or so, i have been having this, I guess, psychological itch. It shows no sign of rash or reddness or any kind of mark except ofcourse the ones I get from straching. It usually happens at night before going to bed and keeps me up the whole night, but has also happened to me when I wake up and when I'm at school. I can be itchy everywhere, scalp of the head to the bottom of my feet, all at the same time as if I had the chicken pox but eventually it will go away and I'll be fine again. I can be fine again for days and I've tracked what I eat, it doesn't seem to be food related. I have cats, but I've had cats since I was born. I feel like I'm making it up in my head but have no control over it. Someone please help!