I've had nothing like this happen, but somehow I get this--I was spooked by anecdotes about SIDS before having kids. When we had our daughter, and she was sleeping in her crib in our room, the first couple of months I'd basically wake up when she wasn't making noise, would then in dazed half-sleep wait for her to make any noise to confirm she was still alive (or check, sometimes), and could only then fall back asleep again. This only really quieted down one year in, when the statistical risk goes down. I guess it's fairly easy to get hypersensitized to dangers like this.