Pokémon Sleep has announced that to update to the app’s new version, maintenance will be conducted from May 21st, 2026 at 0:30 a.m. to 5:00 a.m.

Maintenance and Version 3.5.0 Update

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

Maintenance Period:
Starts: May. 21, 2026, at 0:30 a.m.
Ends: May. 21, 2026, at 5:00 a.m.

Points to Be Updated - New Features

Preparation for new events

Dragon-Type Pokémon Spotlight Week
Latios and the Soul Dew

Balance Adjustments

Adjustments to certain helper Pokémon’s helping stats

Wigglytuff
• Frequency shortened
• Ingredient finding chance increased
• Carry limit increased
Adjustments to the energy recovery effects from dishes

When helper Pokémon recover Energy from dishes, Pokémon with low Energy will receive a stronger recovery effect.

Other

Some text adjusted or unified
Other small bug fixes and adjustments

Adjustments Slated for Future Updates

Adjustments to the kinds of Pokémon you can encounter in each area
We have noted that since each researcher has different Pokémon they would like to encounter, the increase in Pokémon you can encounter in each area has made it difficult to encounter specific Pokémon.

In order to make it easier to encounter Pokémon you wish to, we are currently looking into adjusting the species of Pokémon you can encounter in each area for future updates.
Note: After the adjustments, the species of Pokémon you can encounter in each area will change.
Note: For details on the species of Pokémon you can encounter, please check the Area Dex after the update.

How to Check the Area Dex
1. From the home screen, tap Main Menu > Map
2. Tap the area you would like to check
3. Tap “Area Dex” on the pop-up that appears

Source: https://www.pokemonsleep.net/en/news/333939363830353938383635363038373130/