Problem Sleepiness

Causes of Fatigue Slideshow Pictures

Quick GuideSleep Disorders Pictures Slideshow: A Visual Guide to Sleeping Disorders

Sleep Disorders Pictures Slideshow: A Visual Guide to Sleeping Disorders

What causes problem sleepiness?

Sleepiness can be due to the body's natural daily sleep-wake cycles, inadequate sleep, sleep disorders, or certain drugs.

Sleep-wake cycle

Each day there are two periods when the body experiences a natural tendency toward sleepiness; during the late night hours (generally between midnight and 7 a.m.) and again during the midafternoon (generally between 1 p.m. and 4 p.m.). If people are awake during these times, they have a higher risk of falling asleep unintentionally, especially if they haven't been getting enough sleep.

Inadequate sleep

The amount of sleep needed each night varies among people. Each person needs a particular amount of sleep in order to be fully alert throughout the day. Research has shown that when healthy adults are allowed to sleep unrestricted, the average time slept is 8 to 8.5 hours. Some people need more than that to avoid problem sleepiness; others need less.

If a person does not get enough sleep, even on one night, a "sleep debt" begins to build and increases until enough sleep is obtained. Problem sleepiness occurs as the debt accumulates. Many people do not get enough sleep during the work week and then sleep longer on the weekends or days off to reduce their sleep debt. If too much sleep has been lost, sleeping in on the weekend may not completely reverse the effects of not getting enough sleep during the week.

Sleep disorders

Sleep disorders such as sleep apnea, narcolepsy, restless legs syndrome, and insomnia can cause problem sleepiness. Sleep apnea is a serious disorder in which a person's breathing is interrupted during sleep, causing the individual to awaken many times during the night and experience problem sleepiness during the day. People with narcolepsy have excessive sleepiness during the day, even after sleeping enough at night. They may fall asleep at inappropriate times and places. Restless legs syndrome (RLS) causes a person to experience unpleasant sensations in the legs, often described as creeping, crawling, pulling, or painful. These sensations frequently occur in the evening, making it difficult for people with RLS to fall asleep, leading to problem sleepiness during the day. Insomnia is the perception of poor-quality sleep due to difficulty falling asleep, waking up during the night with difficulty returning to sleep, waking up too early in the morning, or unrefreshing sleep. Any of these sleep disorders can cause problem sleepiness.

Subscribe to MedicineNet's Depression Newsletter

By clicking Submit, I agree to the MedicineNet's Terms & Conditions & Privacy Policy and understand that I may opt out of MedicineNet's subscriptions at any time.

  • Problem Sleepiness - Treatment

    What are the causes of your problem sleepiness and which treatments have you tried?

    Post View 2 Comments
  • Problem Sleepiness - Experience

    Please describe your experience with problem sleepiness.

    Post View 1 Comment
  • Problem Sleepiness - Symptoms

    Describe other symptoms associated with your problem sleepiness.

    Post View 1 Comment
  • Problem Sleepiness - Medical Conditions and Drugs

    Please describe a medical condition or drug that may have caused your problem sleepiness.

  • Problem Sleepiness - Adolescents

    Are you a teen or college student with signs of problem sleepiness? Please share your story.

    Post View 1 Comment
  • Problem Sleepiness - Shift Work

    Do you work the late shift or perform shift work? If so, please describe your sleep problems.

    Post View 1 Comment

Health Solutions From Our Sponsors