Some Pixel alarms are still failing. These quick checks give your alarm the best shot at waking you up.
Muting your ringer won't silence alarms, but a low alarm slider will. Google says keep it above 30%.
Check that Alarms are allowed in Do Not Disturb and in Bedtime mode.
Google's own help page says alarms need Clock notifications enabled in Settings.
Set Clock to Unrestricted battery use and use a built-in tone instead of a streaming song.
Alarms set too close together can cancel each other. Keep your phone cool overnight, too.
Android Alarm Didn’t Go Off? Check These 8 Settings Before Tomorrow Morning