Sleep Science

About Sleep Science

Sleep Science is a free general knowledge quiz with 15 multiple-choice questions with a mix of 8 easy, 6 medium, 1 hard questions. How much do you know about the science of sleep and dreams? A typical run takes about 7 minutes, hints are always one tap away, and your streak ticks up the first time you finish a game on a given day.

A few sample questions

1. 1. What does REM stand for in the sleep cycle?

   Answer: Rapid Eye Movement

   REM stands for Rapid Eye Movement, a sleep stage characterized by quick eye movements, increased brain activity, and vivid dreaming.

2. 2. How many stages of sleep are there in one complete sleep cycle?

   Answer: Four

   There are four stages of sleep: three stages of non-REM sleep (N1, N2, and N3) plus REM sleep. A complete cycle takes about 90 minutes and repeats several times per night.

3. 3. What hormone does the brain produce to make you feel sleepy?

   Answer: Melatonin

   Melatonin is produced by the pineal gland in response to darkness. It signals to the body that it is time to sleep, helping regulate the sleep-wake cycle.

4. 4. What is the body's internal 24-hour clock called?

   Answer: Circadian rhythm

   The circadian rhythm is the body's internal 24-hour clock that regulates sleep-wake cycles, hormone release, body temperature, and other vital functions.

5. 5. During which stage of sleep does the body do most of its physical repair and growth?

   Answer: Stage N3 (deep sleep)

   Stage N3, also called deep sleep or slow-wave sleep, is when the body performs most physical repair, tissue growth, and immune system strengthening.

Things you'll learn along the way

• ✓Insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or waking up too early. It can be acute (short-term) or chronic (long-term).
• ✓Sleep apnea causes repeated pauses in breathing during sleep, sometimes hundreds of times per night. It can lead to poor sleep quality, daytime fatigue, and cardiovascular problems.
• ✓The most vivid and memorable dreams occur during REM sleep, when the brain is highly active. REM periods get longer as the night progresses.