I'm one week away from the start of the trial, and I'm hopeful but nervous!

I was wondering how those of you who have been through the neck movement restrictions sleep? I picked up a couple of neck support pillows. Have you used those or have you just slept flat on the mattress? I'm a side sleeper, though, so I'm just not sure how being just on the mattress would work for me and I'd appreciate your experiences.

As you may know, I tend to over-prepare ahead of time, but it makes me feel better