Tweaked My Back/Neck/Spine...?

This is long, apologies, but want to go into detail for you fitness detectives:

Alright so I have done something to upset my back. It is a sharp pain/stiffness at what I would call the base of my neck/upper back, right in the center along the spine. Kind of smack in between the scapulas.

The tightness is felt constantly, but there isn't really pain unless I'm tilting my head forward or backwards. Side to side/rotation doesn't hurt.

I've had similar tightness before (frequently, actually) but to a lesser extent, and have always attributed it to 'sleeping on it wrong'. Whatever that means. Usually goes away after a day. This time is much worse, however, and I can pinpoint the 'tweak' to when I was bench pressing on Tuesday (I've never felt this pain previously while benching). I was on my 7th rep of a set so it's not like I was overexerting myself on some weight I couldn't handle, but I was definitely in "fight through one more rep" mode. Half way through the rep I felt the area on my back tighten up. I was able to finish the rep, and the pain lingered for 10 minutes or so, but it lessened and I finished the workout (and the day) without any real pain or issue.

I woke up on Wednesday and the pain was back and worse, and has been progressively worse since then. I could barely sleep last night. Supposed to hit a back workout today but I'm debating that.

Now I'm trying to figure out the root cause here. Kind of what's the chicken and what's the egg. I've always considered my bench press form to be above average. Naturally, I'm hoping that I -am- doing something wrong when I'm sleeping, and the workout just amplified it this time. I often fall asleep in the position that is right now literally the most painful, but maybe that is just a coincidence. It's obvious this time that I tweaked it while benching, so I'm wondering if this is a common problem? Is there some bad form that can lead to this type of injury?