Pokémon Sleep has announced details about the Good Sleep Day #9 which takes place from Tuesday, April 23rd, 2024, at 4:00 a.m. to Friday, April 26th, 2024 at 3:59 a.m.

Event: Good Sleep Day #9

Rest your very best on the night of the full moon! This event is held once a month in all areas for a total of three days: on the day of the full moon and the days before and after it. During this time, Drowsy Power will be multiplied by 1.5 on the days before and after the full moon (April 23 and 25), and on the day of the full moon (April 24), it will be multiplied by 2.5. Let’s all try to get lots of sleep during the event and research loads of Pokémon sleep styles!

Day 1: Tuesday, April 23, at 4:00 a.m. to Wednesday, April 24, at 3:59 a.m.
Day 2 (the night of the full moon): Wednesday, April 24, at 4:00 a.m. to Thursday, April 25, at 3:59 a.m.
Day 3: Thursday, April 25, at 4:00 a.m. to Friday, April 26, at 3:59 a.m.

How to Progress in the Event

Participating in the event is easy! Simply press the “Sleep” button before going to sleep during the event to track your sleep. A variety of event-related effects will trigger during your sleep research.
Note: Event bonuses can trigger in any area during this event.

— Night of the Full Moon (April 24) —
Drowsy Power ×2.5
Pokémon Sleep EXP ×3
Bonus Sleep Points +1,000

— Other Days (April 23 and 25) —
Drowsy Power ×1.5
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 events 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 within the event period.
• If you wait to report sleep data that was tracked before the event begins and select “Review Later” during the event, event bonuses will not be applied.
• If you wait to report sleep data that was 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 in a day.
• Event bonuses do not apply to sleep tracking during the tutorial.
• Event bonuses will be triggered 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/5467/