You should always start your sleep session as soon as you are ready to start falling asleep, so you get the best approximation of how long it takes you to fall asleep. You should stop your sleep session after your final wake period.
You should always start your sleep session as soon as you are ready to start falling asleep, so you get the best approximation of how long it takes you to fall asleep. You should stop your sleep session after your final wake period.