I went into the Gym today to do chest, I did it back on Sunday as well. Started benching and noticed the weight felt a little heavier than usual and didn't hit my numbers I hit on Sunday.
I got home, checked my lifting logs, and then realized this was my 9th day in a row lifting heavy weights. Stupid me didn't take any rest days. Looks like tomorrow will be a day off, or just an easy walk on the treadmill.