Starting Wednesday, March 31 at 4:30 AM (UTC), Pokémon Sleep will go into maintenance for an update to version 3.4.0. This operation is expected to last about four and a half hours, concluding at 9:00 AM (UTC).
This update prepares the game for the Latias research event scheduled for April 6, while also bringing some minor balance adjustments for Absol and Kangaskhan.