If you are experiencing that Sleep Cycle crashes at launch or when trying to start the alarm, Sleep Cycle most probably have issues accessing the microphone in your phone. To make sure you are having the issue we are aware of, please open the app Voice Memo in your phone and try if you can record anything.
If you can't, you have been affected by this problem.
Please try to Reset all your settings in your iPhone, we have seen that this have worked well for other users.
iPhones Settings —> General —> Reset —> Reset all settings.
Restart your phone and try Sleep Cycle again!