The Official Pokémon YouTube channel | Pokémon Sleep now lets you track your sleep with your smartwatch! @pokemon | Uploaded 2 weeks ago | Updated 1 day ago
Pokémon Sleep is now compatible with most smartwatches!

You can now use the sleep data tracked via smartwatches—such as Apple Watch, Samsung Galaxy Watch, Google Pixel Watch, and Fitbit—to conduct sleep research in Pokémon Sleep. Not all devices are compatible.

By tracking sleep with your smartwatch and syncing with Pokémon Sleep, you can meet even more Pokémon!

Check the link below for more details about smartwatch pairing and Pokémon Sleep.
pokemonsleep.net/en/devices