I never set the alarm with Zoey, she was in bed with me and i would have felt her moving if she needed to go but that never happened, she slept thru the night from day 1. At 8 weeks she would sleep about 7 hours before she got up
I would think you will hear the puppy if she gets up and she is right next to you, I wouldnt set an alarm, I would wait and see. No reason to get up for nothing. You might get lucky and get one that sleeps all night long.