Please note the following.
(1) To track your sleep with the Pokémon GO Plus +, you need to pair it with Pokémon Sleep or Pokémon GO first.
Please check here for details about pairing the Pokémon GO Plus + and Pokémon Sleep.
Please check here for details about pairing the Pokémon GO Plus + and Pokémon GO.
(2) If your sleep session is shorter than 1 hour and 30 minutes, your sleep data won’t be saved in your Pokémon GO Plus +.
If the issue still persists, one or more of the following may be the cause of the issue.
・ Drained battery
・ Operational error
・ Issue with the application
・ Issue with your device’s operating environment
・ Issue with your sleep environment and/or tracking environment