According to some estimates , This is likely because working through the night and sleeping during the way goes against the normal human sleep-wake cycle. Trying to sleep with noise from buses, trains, trucks, honking cars, construction, and other sounds can be difficult.
Even otherwise pleasant sounds, such as from animals, can disrupt sleep during the late or early morning hours. These types of noises, called environmental noise or noise pollution, may significantly reduce sleep quality over time.
However, everyone has different temperature preferences. Exposure to light 2 hours before bedtime or during sleep can change when the body starts to feel sleepy. It can also be difficult to fall and stay asleep in bright environments. If light interference is a problem, try using items that can block light, such as blackout curtains or eye masks. Medical conditions may also impact sleep and cause a person to fall asleep randomly. We explore some below.
People with insomnia have a hard time staying or falling asleep. They may also wake up very early and be unable to fall back asleep. One of the most common daytime symptoms of insomnia is being very drowsy during the day.
People with obstructive sleep apnea OSA have difficulty getting air into the lungs due to an obstruction in the upper airway. A person with OSA often makes snorting or gasping noises periodically while sleeping. These gasps and snorts disrupt sleep, which can result in waking up several times.
Treatment for OSA involves clearing the obstruction, usually by using continuous positive airway pressure devices. Early diagnosis is a crucial first step to understanding and managing the disorder. By subscribing you agree to the Terms of Use and Privacy Policy. Health Topics. Health Tools. Reviewed: September 9, Medically Reviewed. But if a child or teen habitually falls asleep in school, or an adult finds themselves constantly dozing off at work, despite sleeping enough at night, a sleep disorder may be to blame.
One such sleep problem is narcolepsy , a neurological disorder that triggers overwhelming and sudden episodes of sleep and sleepiness during the day, and potentially irregular sleep at night, too, according to the National Institute of Neurological Disorders and Stroke. The chronic condition leaves the brain unable to regulate sleep and wake cycles, per MedlinePlus. According to the Stanford Medicine Center for Narcolepsy , narcolepsy is the second most common cause of excessive daytime sleepiness diagnosed by sleep centers, right after obstructive sleep apnea.
Such episodes can occur multiple times throughout a day and last for varying amounts of time. People will usually wake up feeling refreshed but then have another sleep attack episode after a very short period of time.
People with narcolepsy experience sleep attacks because the brain is not able to properly regulate its sleep and wake cycles. People with the condition may go right into REM rapid eye movement sleep without first entering NREM sleep non-rapid-eye-movement , and this can happen both during the night and in the daytime. The disruption of normal sleep-wake cycles leads to poor sleep at night, too, according to Harvard Medical School.
While excessive daytime sleepiness persistent sleepiness during waking hours regardless of how much sleep you get the night before is a key early symptom of narcolepsy, many people who have extreme fatigue during the day may not initially suspect that they have the condition.
J Thorac Dis. Sleep research goes wild: new methods and approaches to investigate the ecology, evolution and functions of sleep. Zhang H, Jacobs J. Traveling theta waves in the human hippocampus. J Neurosci. Behavioral strategies, including exercise, for addressing insomnia. Survey of a national representative sample of adults. Your Privacy Rights. To change or withdraw your consent choices for VerywellHealth. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page.
These choices will be signaled globally to our partners and will not affect browsing data. We and our partners process data to: Actively scan device characteristics for identification. I Accept Show Purposes. Table of Contents View All. Table of Contents. How Sleepiness Occurs. How Fast Is Too Fast? Causes of Excessive Sleepiness. Testing for Excessive Sleepiness.
Recap The longer you're awake, the more a chemical called adenosine builds up in your brain. Recap Excessive sleepiness is caused by not getting enough sleep.
Frequently Asked Questions How can I fall asleep faster? Is getting too much sleep bad for you? Was this page helpful? Thanks for your feedback! Sign Up. What are your concerns? Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Related Articles. Types of Sleep Disorders: Know the Symptoms. Feeling Sleepy? Discover 10 Tips for Staying Awake and Alert. An Overview of Sleep Inertia. Frozen in Fear: Experiencing Sleep Paralysis. Psoriatic Disease Sleep Problems and Solutions. Neurological Wellness Clinic, located in Waukesha County, is an independent neurology practice that is committed to providing patients with the most innovative and comprehensive advancements in neurological sciences while at the same time delivering compassionate care.
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