Yes. Occasionally it will wait until the last moment of the 30min window to go off, which just means that I was unfortunate enough to be in deep sleep for that entire period. Unfortunately it is not very customizable, but it is definitely worth the app’s cost if you already have an iPhone.
This one Sleep Cycle? http://mdlabs.se/sleepcycle/
Yes. Occasionally it will wait until the last moment of the 30min window to go off, which just means that I was unfortunate enough to be in deep sleep for that entire period. Unfortunately it is not very customizable, but it is definitely worth the app’s cost if you already have an iPhone.