Pokémon Sleep’s Good Sleep Day #38 will run from Aug. 27 at 4 a.m. to Aug. 30 at 3:59 a.m., with the Aug. 28 full moon bringing the event’s biggest bonuses across all areas. On the full moon night, Drowsy Power will be doubled, Helper Pokémon will gain three times as much Sleep EXP and players will receive 1,000 bonus Sleep Points, while the surrounding days will provide 1.5× Drowsy Power, 2× Helper Pokémon Sleep EXP and 500 bonus Sleep Points. Cleffa, Clefairy and Clefable will also have increased appearance rates throughout the event, with their rates boosted further on the full moon night, while undiscovered sleep styles will be more likely to appear during sleep research. A Good Sleep Day Bundle Vol. 38 will also be available from Aug. 25 at 11 p.m. to Aug. 30 at 10:59 p.m. for 1,500 diamonds, containing nine Great Biscuits, two Luck Incense, two Growth Incense and two Focus Incense.
Source: Official Pokémon Sleep news and PokemonSleep.net