Hi Celsie. We have a breathing alarm - not an angelcare one though, we got it through the SIDS foundation. We always check to see that the alarm is working - probably a bit too much!!! - and ceiling fans do the same thing. We can't have it on 3 in aricyns room without it affecting the alarm, so that could be something for people to be mindful of as well.
Cheers
Mel