Pokémon Sleep has announced that to update to the app’s new version, maintenance will be conducted from March 31st, 2026 at 0:30 a.m. to 5:00 a.m.

Maintenance and Version 3.4.0 Update

To update to the app’s new version, maintenance will be conducted during the following time period.

Maintenance Period
Starts: Mar. 31, 2026, at 0:30 a.m.
Ends: Mar. 31, 2026, at 5:00 a.m.

New Features

Preparation for new events
Latias Research
Please see the event’s upcoming News announcement for more details.

Addition of a New Relaxing Sound
A Stroll through the South Province (Paldea)

Balance Adjustments

Changes to certain Pokémon’s main skills

Absol
Before change: Charge Strength S
After change: Charge Strength M

Notes: Main skill levels will be maintained after the update.
Main skills of Pokémon you have already befriended will also change.

Adjustments to certain helper Pokémon’s helping stats
Kangaskhan
• Main skill chance increased slightly

Other

• Some text adjusted or unified
• Other small bug fixes and adjustments

Source: https://www.pokemonsleep.net/en/news/333831353336353834333636383137323835/