OMG the same thing happens to me sometimes when im about to fall asleep and it can last from 5 min to 2 hours too "15- breathing weakness as I fall asleep, like I forget to breathe as I'm dropping off to sleep, and then am jerked awake with a racing heart and being out of breath. This can go on every 5 minutes or so for hours!!!!" I thought it might be sleep apnea or something I dont know but its freaking scary! Does this still happen to you? I am about 2 weeks mirena free and I just feel like crap I was doing ok but today was just a bad day :(