Although the likelihood of sleep data not being recorded increases when the application is run in the background, it's still possible to do so.
However, to help prevent tracking from failing, it is recommended that you leave the application running during the sleep session.
For those concerned about battery consumption, please read the following cautions and track sleep with the screen off and the application running in the background.
Additionally, when running the application in the background, please take note of the following:
・ There is a chance that recording will stop if you use another application once sleep tracking has started.
・ There is also a chance that your device will automatically close Pokémon Sleep while it is running in the background. If this happens, your sleep session will end.
・ It is recommended that you use push notifications to keep the application running after turning the screen off, but it is also possible to continue recording sleep with the screen simply turned off.