Top 10 Sleep Myths

Myth 1: Sleep is a time when your body and brain shut down for rest and relaxation.

No evidence shows that any major organ (including the brain) or regulatory system in the body shuts down during sleep. Some physiological processes actually become more active while you sleep. For example, secretion of certain hormones is boosted, and activity of the pathways in the brain needed for learning and memory is heightened.

Myth 2: Getting just 1 hour less sleep per night than needed will not have any effect on your daytime functioning.

This lack of sleep may not make you noticeably sleepy during the day. But even slightly less sleep can affect your ability to think properly and respond quickly, and it can compromise your cardiovascular health and energy balance as well as the ability to fight infections, particularly if lack of sleep continues. If you consistently do not get enough sleep, eventually a sleep debt builds up that will make you excessively tired during the day.

Myth 3: Your body adjusts quickly to different sleep schedules.

Your biological clock makes you most alert during the daytime and most drowsy at night. Thus, even if you work the night shift, you will naturally feel sleepy when nighttime comes. Most people can reset their biological clock, but only by appropriately timed cues—and even then, by 1–2 hours per day at best.

Consequently, it can take more than a week to adjust to a dramatically altered sleep/wake cycle, such as you encounter when traveling across several time zones or switching from working the day shift to the night shift.

Myth 4: People need less sleep as they get older.

Older people don’t need less sleep, but they often get less sleep or find their sleep less refreshing. That’s because as people age, they spend less time in the deep, restful stages of sleep and are more easily awakened. Older people are also more likely to have insomnia or other medical conditions that disrupt their sleep.

Myth 5: Extra sleep at night can cure you of problems with excessive daytime fatigue.

Not only is the quantity of sleep important but also the quality of sleep. Some people sleep 8 or 9 hours a night but don’t feel well rested when they wake up because the quality of their sleep is poor. A number of sleep disorders and other medical conditions affect the quality of sleep. Sleeping more won’t alleviate the daytime sleepiness these disorders or conditions cause. However, many of these disorders or conditions can be treated effectively with changes in behavior or with medical therapies.

Myth 6: You can make up for lost sleep during the week by sleeping more on the weekends.

Although this sleeping pattern will help relieve part of a sleep debt, it will not completely make up for the lack of sleep. This pattern also will not make up for impaired performance during the week because of not sleeping enough. Furthermore, sleeping later on the weekends can affect your biological clock so that

it is much harder to go to sleep at the right time on Sunday nights and get up early on Monday mornings.

Myth 7: Naps are a waste of time.

Although naps do not substitute for a good night’s sleep, they can be restorative and help counter some of the impaired performance that results from not getting enough sleep at night.

Naps can actually help you learn how to do certain tasks quicker. But avoid taking naps later than 3 p.m., as late naps can interfere with your ability to fall asleep at night. Also, limit your naps to no longer than 1 hour because longer naps will make it harder to wake up and get back in the swing of things. If you take frequent naps during the day, you may have a sleep disorder that should be treated.

Myth 8: Snoring is a normal part of sleep.

Snoring during sleep is common, particularly as a person gets older. Evidence is growing that snoring on a regular basis can make you sleepy during the day and more susceptible to diabetes and heart disease. In addition, some studies link frequent snoring to problem behavior and poorer school achievement in children. Loud, frequent snoring can also be a sign of sleep apnea, a serious sleep disorder that should be treated.

Myth 9: Children who don’t get enough sleep at night will show signs of sleepiness during the day.

Unlike adults, children who don’t get enough sleep at night typically become more active than normal during the day. They also show difficulty paying attention and behaving properly. Consequently, they may be misdiagnosed as having attention deficit hyperactivity.

Myth 10: The main cause of insomnia is worry.

Although worry or stress can cause a short bout of insomnia, a persistent inability to fall asleep or stay asleep at night can be caused by a number of other factors. Certain medications and sleep disorders can keep you up at night. Other common causes of insomnia are depression, anxiety disorders, and asthma, arthritis, or other medical conditions with symptoms that become more troublesome at night. Some people who have chronic insomnia also appear to be more revved up than normal, so it is harder for them to fall asleep.

What Does Sleep Do for You?

Your Hormones

When you were young, your mother may have told you that you need to get enough sleep to grow strong and tall. She may have been right! Deep sleep triggers more release of growth hormone, which fuels growth in children and boosts muscle mass and the repair of cells and tissues in children and adults. Sleep’s effect on the release of sex hormones also encourages puberty and fertility.

Consequently, women who work at night and tend to lack sleep are, therefore, more likely to have trouble conceiving or to miscarry. Your mother also probably was right if she told you that getting a good night’s sleep on a regular basis would help keep you from getting sick and help you get better if you do get sick. During sleep, your body creates more cytokines—cellular hormones that help the immune system fight various infections. Lack of sleep can reduce the ability to fight off common infections. Research also reveals that a lack of sleep can reduce the body’s response to the flu vaccine.

For example, sleep-deprived volunteers given the flu vaccine produced less than half as many flu antibodies as those who were well rested and given the same vaccine. Although lack of exercise and other factors are important contributors, the current epidemic of diabetes and obesity appears to be related, at least in part, to chronically getting inadequate sleep.

Evidence is growing that sleep is a powerful regulator of appetite, energy use, and weight control. During sleep, the body’s production of the appetite suppressor leptin increases, and the appetite stimulant grehlin decreases. Studies find that the less people sleep, the more likely they are to be overweight or obese and prefer eating foods that are higher in calories and carbohydrates. People who report an average total sleep time of 5 hours a night, for example, are much more likely to become obese compared to people who sleep 7–8 hours a night.

A number of hormones released during sleep also control the body’s use of energy. A distinct rise and fall of blood sugar levels during sleep appears to be linked to sleep stage. Not getting enough sleep overall or enough of each stage of sleep disrupts this pattern. One study found that, when healthy young men slept only 4 hours a night for 6 nights in a row, their insulin and blood sugar levels mimicked those seen in people who were developing diabetes. Another study found that women who slept less than 7 hours a night were more likely to develop diabetes over time than those who slept between 7 and 8 hours a night.

Sleep - Graveyard Shift

Try to limit night shift work, if that is possible. If you must work the night shift, the following tips may help you:

·         Increase your total amount of sleep by adding naps and lengthening the amount of time you allot for sleep.

·         Use bright lights in your workplace.

·         Minimize your shift changes so that your body’s biological clock can adjust to a nighttime work schedule.

·         Get rid of sound and light distractions in your bedroom during your daytime sleep.

·         Use caffeine only during the first part of your shift to promote alertness at night.

If you are unable to fall asleep during the day, and all else fails, talk with your doctor to see if it would be wise for you to use prescribed, short-acting sleeping pills to help you sleep during the day.