The next Pokémon Sleep in-game event, New Moon Day #11, is scheduled to run from March 18 to March 21. The recurring event typically encourages players to focus on sleep tracking during the new moon period and often brings bonuses that help with research and progression. Alongside the event, the New Moon Day Bundle Vol. 11 will be released in the shop, offering items that can help players prepare for the limited time bonuses. Fans who regularly track their sleep in the game can look forward to taking advantage of the event and grabbing the bundle when it becomes available.
Source: Official Pokémon Sleep news and PokemonSleep.net
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