Have some questions about sleep?

What’s the best amount of sleep?
When should I go to bed?

Notes:

  • Pokémon Sleep is intended for entertainment purposes only and is not intended for use in detection, diagnosis, or treatment of any medical condition or disease.
  • The information provided in this article—and the sleep score registered through Pokémon Sleep—does not represent or substitute for a diagnosis from a physician or health care professional, and it cannot be used as a diagnostic or therapeutic treatment for a sleep disorder. Users should seek medical attention in case they present signs or symptoms that could be associated with sleep disorders.
  • Please note that the information in this article is intended for adults regarding sleep unless otherwise stated.

The best amount of sleep is enough to not feel sleepy during the day. As long as you’re getting enough sleep, you shouldn’t feel sleepy when you’re awake. Because of this, we should try to get the same amount of sleep every day, including days off. Ideally, we should go to bed at an hour when we can fall asleep easily, rather than going out of our way to match someone else’s schedule.

The changing of the seasons seems to be a factor in how long we sleep. It’s believed that we sleep less when days are longer and more when days are short.

The only way to find the best amount of sleep for you is to try sleeping a little more at a time.
First, try going to bed 30 minutes earlier than usual, and then note if you’re able to get up easily in the morning, and whether or not you feel sleepy during the day. If you’re still sleepy in the daytime, try sleeping another 30 minutes more. Continue this for at least five days in a row, comparing your ability to function each day with the day before, and you’ll be able to figure out the best amount of sleep for you.

About Dr. Yanagisawa

Masashi Yanagisawa
CEO of S’UIMIN Inc.

Born in Tokyo in 1960, Masashi Yanagisawa completed his medical doctorate at a graduate school in the University of Tsukuba and is a member of the National Academy of Sciences. In 1987, he discovered the vasoconstricting peptide endothelin while in graduate school, and in 1988 he discovered orexin, a neuropeptide that regulates sleep and wakefulness. At 31 years of age, Professor Yanagisawa came to the United States, where he presided over laboratories at the University of Texas and at the Howard Hughes Medical Institute over the span of 24 years. He founded the International Institute for Integrative Sleep Medicine (WPI-IIIS) in 2012, establishing it under the Japanese Ministry of Education, Culture, Sports, Science and Technology’s World Premier International Research Initiative. Professor Yanagisawa founded S’UIMIN Inc. in 2017 and currently acts as CEO.

He supervised the provision of sleep-related information during the development of Pokémon Sleep.

He was awarded a Japanese Medal with Purple Ribbon in 2016, received the Asahi Prize and the Keio Medical Science Prize in 2018, was named a Person of Cultural Merit in 2019, and received the Breakthrough Prize in 2023.