A new area has been added to Pokémon Sleep called the Lapis Lakeside and it will be available on January 24th, 2024.

New Area: Lapis Lakeside

It’s been reported that a new area, Lapis Lakeside, has been found, and it’s likely you’ll encounter new Pokémon there! We hope you complete a Sleep Style Dex goal and further your sleep research at Lapis Lakeside!

Lapis Lakeside Details

Date of the area addition: 3:00 p.m. on January 24, 2024
Requirement for unlocking the area: Complete the Dex goal of registering 240 sleep styles.

Sleep types of Pokémon you can now meet

Note: You can meet these Pokémon at Lapis Lakeside.

Dozing type:
Dratini
Dragonair
Dragonite

Snoozing type:
Ralts
Kirlia
Gardevoir

Slumbering type:
Stufful
Bewear
Gallade
Snorlax’s favorite Berries

Durin Berry (Grass), Mago Berry (Psychic), and Cheri Berry (Fighting)

Source: https://www.pokemonsleep.net/en/news/4559/