I’m testing Sleep Cycle Alarms and they are not sounding?

Sleep Cycle Alarms will sound the next time the alarm window is entered. So if you set an alarm time 10 minutes from now with an alarm window of 30 minutes and a repeat of every day, the alarm will sound for tomorrow as you are already in the alarm window at the time of setting the alarm.

When doing a quick alarm test, set the alarm window to 0 minutes and the alarm time for at least 10 minutes in the future. Always remember to sync your watch after any settings changes.