Pokémon Sleep has announced details about the Good Sleep Day #12 which takes place from Saturday, July 20th, 2024 at 4:00 a.m. to Tuesday, July 23rd, 2024 at 3:59 a.m. Take every opportunity to get a good night's sleep so that you can wake up with a refreshed mind and lots of energy!

Event: Good Sleep Day #12

Rest your very best on the night of the full moon! This event is held once a month for a total of three days—on the day of the full moon and the days before and after it—and provides a boost to Drowsy Power! Let’s try to get lots of good sleep during this time and research loads of Pokémon sleep styles! The event also includes bonus sleep points and bonuses to Pokémon’s Sleep EXP gains.
Event Period: Saturday, July 20, at 4:00 a.m. to Tuesday, July 23, at 3:59 a.m.
Note: The day of the full moon is Sunday, July 21.

Event Areas: All areas

Bonuses

The following bonuses will trigger when you conduct sleep research in applicable areas during the event.

— Night of the Full Moon (July 21) —
Drowsy Power ×2
Helper Pokémon Sleep EXP ×3
Bonus Sleep Points +1,000

— Other Days (June 20 and 22) —
Drowsy Power ×1.5
Helper Pokémon Sleep EXP ×2
Bonus Sleep Points +500

Multipliers for Drowsy Power

The multipliers for Drowsy Power on the night of a full moon during Good Sleep Day depend on the day of the week. The planned multipliers are as follows.

Drowsy Power Multipliers on the Night of a Full Moon
Monday: ×4
Tuesday: ×3
Wednesday: ×2.5
Other days: ×2

Notes: Drowsy Power on the days before and after a full moon will always be multiplied by 1.5 regardless of the day of the week.
The above multipliers dependent on the day of the week are subject to change.

Notes about Good Sleep Day

• [Important] Each day of the Good Sleep Day event rolls over at 4:00 a.m.
• Event bonuses apply only to sleep data tracked during the event.
• If you wait to report sleep data tracked before the event began and select “Review Later” during the event, event bonuses will not be applied.
• If you wait to report sleep data tracked during the event and select “Review Later” after the event has ended, event bonuses will be applied.
• You can only receive bonus sleep points once per day. You will not receive bonus sleep points for the second sleep session of the day.
• Event bonuses do not apply to sleep tracking during the tutorial.
• Event bonuses will trigger regardless of which site you conduct your sleep research in.
• The effects of incense stack with Good Sleep Day effects. If you use Growth Incense on the night of the full moon, EXP gains will be multiplied by 6 (×3 from the full moon bonus and ×2 from the Growth Incense bonus).

Source: https://www.pokemonsleep.net/en/news/313532323239393532333239303839303235/