On setting up the alarm, you need to select the time interval for the alarm to go off. If there is no REM phase during the set up of the time interval, the alarm will go off at the end of the selected interval.
For the correct functioning of the alarm feature it is important to set up the time interval of at least 30 minutes, preferably more.
If this does not apply to your situation and your settings are correct, please send us screenshots of your alarm settings in your Healbe app and let us know the exact date and time when you experienced the problem. Please email this information to us at firstname.lastname@example.org and we will investigate the issue.