hello guys, so i have a different type of question today. ive been trying to DEILD and i set up an auto-shut vibration alarm, to wake me up. its been 2-3 days, but i find myself waking up a little before the alarm for no reason, and theres like 10-15 minutes left before the alarm goes off and then i cant sleep easily and be in a dream. and this can happen several times too. why does this happen and how do i fix it to ensure that i wake up exactly to the vibrations?

thanks a lot as always