It's probably developing slower because of the lower temperature and is just a couple days behind.
It's amazing how your brain kicks into a different gear when you have to be careful with something fragile. I usually sleep like a log, but when I had hip surgery and was supposed to only sleep on my back, I never rolled over, even though it was very uncomfortable and I was dying to. Then again when I was pregnant, and again when I had to keep the babies in bed with me for a while. Your subconscious is staying alert even when you're sleeping, making sure you don't hurt whatever fragile thing you're taking care of. Of course, that's certainly not a guarantee and plenty of people roll over onto their wounds/babies/eggs, but it does work a lot of the time.