Neck numbness and tingling is strange. Have you had an MRI of your cervical spine?

I sometimes sleep with a cervical collar on, I also have a memory foam travel pillow I bought at Walmart that is awesome, I use it when sleeping on my side, just tuck it in my neck for support. I sleep with memory foam pillows.

I am a terrible side sleeper. I've finally broken myself of sleeping with my hands above my head, and sleeping on my stomach.