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.