I would say that is hard to say, wouldn't hurt just to test. The only issues I have ran into regarding sound is that sometimes the notifications come in silent. Screen still lights up and the notification is still displayed on the lock screen, just no sound sometimes. Probably just a 15.1 bug though honestly. As far as only needing the alarm three days a week, the way you have it makes sense, however, if those three days a week are consistent week by week, the bedtime feature will still work, you just set the days that you want it to trigger.