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What Do You Know About Sleep?

Sleep is as important as the food you eat and the air you breathe. Find out more about sleep by taking this quiz.

1. Babies who are 4 to 12 months old need about how many hours of sleep in 24 hours?

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How much sleep a person needs depends in large part on age. Babies who are 4 to 12 months old need about 12 to 16 hours. School-aged children need 10 to 11 hours. Teens need 8 to 10 hours. Most adults seem to need 8 to 9 hours of sleep a night. People in their first trimester of pregnancy often need extra sleep.

A. 8 hoursB. 10 hoursC. 12 to 16 hoursD. 19 hours

2. Each night when you sleep, you move through several stages. How long does a complete sleep cycle take?

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You pass through 4 stages of sleep during one sleep cycle: N1, N2, N3, and REM. REM stands for rapid eye movement. One complete cycle usually takes 90 to 110 minutes. N1 is the transition from wakefulness to deeper sleep. N2 is intermediate sleep and makes up 40% to 50% of adult sleep time. N3 is deep sleep and makes up about 20% of sleep time. The amount of N3 decreases as you age. Adults spend about 20% of their time in REM sleep, when dreams occur. (Babies spend about half their sleeping hours in REM sleep.) During REM cycles, the brain is as active as when you are awake. The length of REM periods varies with the time of night. The first REM sleep period usually occurs about 90 minutes after you fall asleep. The first sleep cycles of the night have shorter REM periods and longer periods of deep sleep. As the night progresses, REM sleep periods become longer and the deep sleep periods get shorter. Your sleep doesn't have to follow the stages in order. For instance, you can fall asleep right in N2 and progress from N2 to REM.

A. 30 minutesB. 90 to 110 minutesC. 3 hoursD. 4 hours

3. A person who is awakened in the middle of the night by a telephone call may have trouble remembering the conversation the next day. Which is the most likely explanation for this?

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This is normal. It's sometimes known as sleep inertia. Sleep inertia is a short-term (temporary) disorientation after suddenly waking up. It can cause poorer short-term memory and slower speed of thinking. This phenomenon explains not only why middle-of-the-night phone calls are forgotten, but also why people don't remember the alarm ringing after they turn it off, roll over, and go back to sleep.

A. The sleeper was dreaming and thought the conversation was part of a dreamB. The sleeper has trouble remembering things during the dayC. The sleeper has a form of disorientation related to waking up from sleepD. None of the above

4. A sleep disorder called sleep apnea can prevent a person from getting the rest they need. Sleep apnea also has been linked to which of these serious health risks?

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Sleep apnea also is linked to heart failure, irregular heartbeat, stroke, and mood disorders such as irritability and depression. Untreated sleep apnea also raises the risk for accidents, including car accidents, because of sleepiness. It can also lead to headaches in the morning.

A. HypertensionB. Heart attackC. ObesityD. All of the above

5. Which of the following can help prevent snoring?

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Many snorers are overweight. In some people, losing weight can reduce or eliminate snoring. Snoring can be caused by a variety of illnesses. These range from the common cold to sinus problems to overgrowth of the tonsils. Although snoring is a sign of sleep apnea, most people who snore do not have it. People who drink alcohol in the evening also may snore.

A. Losing weightB. Not smokingC. Sleeping on your sideD. All of the above

6. Which of these lifestyle factors can affect the quality of your sleep?

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Exposure to smoke has been linked to a variety of sleeping problems, such as difficulty falling asleep and fragmented sleep. Although many people think that alcohol can help them get to sleep, it keeps them in a light sleep, instead of allowing them to move into REM and deeper sleep. Exercising within a few hours of bedtime can be stimulating and interfere with the body's ability to fall asleep. Being around bright light, such as a computer monitor, late at night also can affect the quality and quantity of sleep.

A. SmokingB. ExerciseC. Drinking alcoholD. All of the above

7. Which of these will help promote better sleep?

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Other tips for getting a good night's sleep include:

Go to bed and get up at the same time every day.
Make your bedroom sleep friendly by keeping it cool, quiet, and dark.
Limit what you eat or drink before bedtime.
Exercise regularly, but not too near bedtime.
If you want to take a nap during the day, limit it to no more than 20 to 30 minutes.

A. Exercising 2 hours before bedtimeB. Reading or listening to musicC. Changing bedtimesD. Having a late dinner

Your score was:

Online Medical Reviewer: Raymond Kent Turley BSN MSN RN
Online Medical Reviewer: Sather, Rita RN
Online Medical Reviewer: Schriber, Andrew D MD

Date Last Reviewed: 5/1/2023

© 2000-2024 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

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