Alarm not going off on Forerunner 265s, even though it is active and correct?

My Forerunner 265s is good at doing any other alarm, it'll work perfectly. When it comes to my 5:00am alarm, it never goes off when I'm wearing it. It is only set to vibrate as to not wake up my boyfriend.

Does Garmin not sound the alarm during sleep mode?

My watch goes to sleep at 10:30pm. I even did a test and left it on my desk beside me last night, nothing happened!

It is on and active, is there anything else I can try?