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Bing Sleep Quiz: 10 Questions With Answers
Sleep is one of the most important biological processes, yet many people don't fully understand how it works. This quiz covers the fascinating science behind sleep, including the different stages your brain goes through and how your body benefits from rest.
Looking for Microsoft's own quiz? It is on your Microsoft Rewards dashboard. This page is our own practice quiz on the same topic, so you can learn the facts first. For the daily image quiz see today's Bing Homepage Quiz.
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Pick A, B or C for each question. The right answer turns green and a short fact explains it.
All 10 questions and answers
Every question with its answer and explanation. Open “Show answer” after you guess.
1 What percentage of the body's energy does the brain use during quiet waking?
- A 20%
- B 30%
- C 10%
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✓ Answer: A. 20%
Did you know? The brain is responsible for 20% of the body's energy use during quiet waking, which is why sleep significantly reduces overall energy consumption.
2 Which brain waves are associated with a person being in a resting state but still fully conscious?
- A Delta waves
- B Beta waves
- C Alpha waves
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✓ Answer: C. Alpha waves
Did you know? Alpha waves are seen when a person is in a resting state but still fully conscious, with eyes closed and body relatively still as it begins to slow down.
3 How long does the average sleep cycle of alternating NREM and REM sleep take?
- A 45 minutes
- B 90 minutes
- C 60 minutes
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✓ Answer: B. 90 minutes
Did you know? The sleep cycle takes an average of 90 minutes and occurs 4-6 times during a good night's sleep.
4 What does REM sleep stand for?
- A Restorative Eye Movement
- B Rhythmic Eye Motion
- C Rapid Eye Movement
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✓ Answer: C. Rapid Eye Movement
Did you know? REM stands for Rapid Eye Movement, though this mode of sleep also involves virtual paralysis of the body and is the main occasion for dreams.
5 According to the AASM, into how many stages is non-REM sleep divided?
- A Two stages
- B Four stages
- C Three stages
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✓ Answer: C. Three stages
Did you know? The American Academy of Sleep Medicine divides NREM into three stages: N1, N2, and N3, with N3 also called delta sleep or slow-wave sleep.
6 Which brain area is considered the most important nexus for controlling sleep timing through the circadian clock?
- A Suprachiasmatic nucleus
- B Ventrolateral preoptic nucleus
- C Pineal gland
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✓ Answer: A. Suprachiasmatic nucleus
Did you know? The suprachiasmatic nucleus (SCN), located directly above the optic chiasm, is presently considered the most important center for the circadian clock that controls sleep timing.
7 What neurotransmitter accumulates in the forebrain during prolonged wakefulness and drives the need for sleep?
- A Cortisol
- B Melatonin
- C Adenosine
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✓ Answer: C. Adenosine
Did you know? Adenosine is a neurotransmitter that accumulates in the cortex and basal forebrain during prolonged wakefulness and acts as a homeostatic regulator of sleep.
8 During which stage of sleep do humans experience the deepest sleep with delta waves?
- A During REM sleep
- B Stage N3 (slow-wave sleep)
- C Stage N1 and N2
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✓ Answer: B. Stage N3 (slow-wave sleep)
Did you know? Delta waves appear in stage N3, the deepest stage of sleep, which is why N3 is also called delta sleep.
9 What type of light exerts the strongest effect on the circadian clock and raises concerns about screen use before bed?
- A Red light
- B Green light
- C Blue light
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✓ Answer: C. Blue light
Did you know? Blue light exerts the strongest effect on the circadian clock, leading to concerns that using screens before bed may interfere with sleep by suppressing melatonin.
10 What hormone is released by the pineal gland at night to regulate the sleep cycle?
- A Cortisol
- B Melatonin
- C Prolactin
Show answer
✓ Answer: B. Melatonin
Did you know? The pineal gland releases melatonin at night, and exposure to even small amounts of light during the night can suppress its secretion and increase wakefulness.
About Sleep
Sleep isn't just about closing your eyes and resting—it's an active process where your brain and body undergo significant changes. During sleep, your body's systems work to restore your immune system, nervous system, and muscles, while your brain cleanses itself of waste products like amyloid. Sleep has been a highly conserved behavior across animal evolution, likely originating hundreds of millions of years ago.
Questions and facts checked against the Wikipedia article Sleep. How we write quizzes: editorial policy.
Sleep Quiz FAQ
Is this the official Bing Sleep Quiz?
No. BingQuiz.net is independent and not affiliated with Microsoft. This is our own free practice quiz on sleep, written from the Wikipedia article linked on this page. Microsoft's quiz is on the Microsoft Rewards dashboard.
Where do I play the official quiz for Microsoft Rewards points?
Sign in to your Microsoft account and open the quiz card on the Microsoft Rewards dashboard (rewards.bing.com) or on Bing.com. Points are only credited there.
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No. Every quiz on BingQuiz.net is free and works without signing up.