Pokémon Sleep’s New Moon Day #19 event runs Nov. 8 at 4 a.m. to Nov. 11 at 3:59 a.m., with the new moon falling Nov. 9. Across all areas, Pokémon will be less likely to get full during the day’s first snack time, and players may encounter Shiny Pokémon or Darkrai, which has a special appearance rate regardless of sleep type; each encounter with a special-appearance Pokémon also grants three additional friendship points. New Moon Day Bundle Vol. 19 will be available Nov. 6 at 10 p.m. to Nov. 11 at 9:59 p.m. for 1,200 diamonds, with one bundle per user containing one Ultra Biscuit, three Great Biscuits, 10 Poké Biscuits and three Friend Incenses.
Source: Official Pokémon Sleep news and PokemonSleep.net