### sleep:

Lack of sleep
* adds to decrease in motivation and slowing of memory.
* affects our ability to concentrate, can alter moods and compromise health
  - judge accurately
* can also affect their mood and behaviour
  - be a silent killer, especially when teens get behind the wheel
  - contribute to acne formation
  - make interpersonal relationships more discordant
  - cause all kinds of problems
  - even cause skin problems, such as acne
  - exacerbate stress
  - have a significant impact on daily functioning and productivity
  - interfere with alertness and mood
  - kill humans a lot more quickly
* can lead to fatigue and a decreased sense of well-being
  - problems in school and on the job, sickness, and possible even death
  - tired lifeless skin and circles under the eyes
  - magnify test anxiety
* can make children irritable and hyperactive, and can result in behavior problems
  - it difficult for a person to perform normal activities
  - occur a number of ways
  - result in symptoms other than snoring
  - trigger mania
  - worsen the symptoms of the illness in the impaired person
* causes a desire to sleep
  - health problems like fatigue, stress, and increased susceptibility to disease
* common contributor to tension headaches.
* increases the risk of having an episode of mania in someone with bipolar disorder.
* interferes with the body's natural restorative and rejuvenative process.
* is also a problem for teen- agers
  - teen-agers
  - associated with irritability, impatience, anxiety, and depression
* is often a result of another physical or emotional problem
  - an important factor in fibromyalgia
  - one of the major causes of stress
  - one of the most common symptoms of fibromyalgia
  - the most common trigger of mania
  - twice as common among working people than among the unemployed and pensioners
* leads to accidents
* serious problem resulting in diminished mental functioning.
* tends to magnify the negative effects of stress.

Normal sleep
* consists of two types.
* goes through different stages.
* helps to restore mental and physical energy.
* is as many hours as a person needs to be bright and alert the following day
  - comprised of various periods of different types of sleep
  - essential to a healthy and productive life
  - punctuated by many periods of arousal
* occurs in a series of cycles.
* takes up a large amount of time in a fast-paced world.
* varies considerably from person to person.

Poor sleep
* affects more women than men and is reported by one in three adults.
* can be a side effect of some medications.
* caused by sleep apnea major public health problem.
* is often related to behaviors and habits that contribute to insomnia problems.
+ Sleep, Sleeping problems: VOA Special English words
  * There are many diseases that cause poor sleep. Fever can lead to bad dreams. Poor sleep can be a side effect of some medications.

Restful sleep
* is also an important part of our overall health
  - as important as exercise or a healthy diet in maintaining overall health
  - important to well-being
* restores energy and allows the body to renew itself.

Sound sleep
* improves learning, memory and performance.
* is also a cause to invalidate ablution.
* provides the opportunity for the brain to release toxins and recover from stress.
* sign of health.

Sleepiness
* can be dangerous
  - part of it, although sleepiness can also be caused by many other things
* increases the likelihood of such lapses.
* slows a person s reaction time, decreases awareness and impairs judgment
  - reaction time, decreases awareness, and impairs judgment