How is my sleep tracked? Pokémon Sleep uses your device’s accelerometer to estimate your sleep state by detecting your body movement. Related articles My tracked sleep time seems different from what I experienced. Why is that? Is it possible to track a sleep session with the application running in the background? I don’t have a Pokémon GO Plus +. Can I play Pokémon Sleep? I’m more of a nocturnal person. Can I play this game even if I sleep during the day? Why can’t I connect to my Pokémon GO Plus +?