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How Sleep Works - How Sleep Works | NHLBI, NIH
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<div class="health-topics-more-information"> <p>MORE INFORMATION</p> <div class="publications-info-link"> <i class="fas fa-book-open"></i> <a href="/resources?f%5B0%5D=related_health_topics%3AHow%20Sleep%20Works"> Fact Sheets and Handouts </a> </div> <div class="research-info-link"> <i class="fas fa-microscope"></i> <a href="/research/sleep-apnea"> Research </a> </div> </div> </div> </div> </div> </div> <div class="layout__region layout__region--second"> <div class="field field--name-field-health-topic node-theme-blue field__item block block-nhlbi-health-topics block-nhlbi-health-topics-book-name"> <div>How Sleep Works</div> </div> <div class="block block-layout-builder block-field-blocknodehealth-topicstitle"> <h1 class="field field--name-title field--type-string field--label-hidden responsive-container responsive-container-constrained field__item"><span class="ht-kicker">How Sleep Works </span>How Sleep Works<hr> </h1> </div> <div class="block block-addtoany block-addtoany-block"> <div class="responsive-container responsive-container-constrained"> <span class="a2a_kit a2a_kit_size_24 addtoany_list" data-a2a-url="https://www.nhlbi.nih.gov/health/sleep" data-a2a-title="How Sleep Works"> <a class="a2a_dd addtoany_share" href="https://www.addtoany.com/share#url=https%3A%2F%2Fwww.nhlbi.nih.gov%2Fhealth%2Fsleep&title=How%20Sleep%20Works"> <img src="/themes/custom/nhlbi/images/share-alt-icon.svg" alt="Share"> </a> <a class="a2a_button_email"></a> <a class="a2a_button_print"></a> </span> </div> </div> <div class="language-switcher-language-url block block-language block-language-blocklanguage-content" role="navigation"> <div class="responsive-container responsive-container-constrained"><h2 class="visually-hidden" aria-label="Switch to Espanol">Language switcher</h2><ul class="links"><li hreflang="en" data-drupal-link-system-path="node/93058" class="is-active" aria-current="page"><a href="/health/sleep" class="language-link is-active" hreflang="en" 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clearfix field__item"><p><img alt="man sleeping" data-entity-type="file" data-entity-uuid="8b5fee0e-727f-4d06-add2-1289e44e584d" data-image-style class="align-right b-lazy" width="768" height="512" data-src="/sites/default/files/inline-images/sleep%20apnea%20-%20shutterstock_1239383362.jpg" src="/modules/custom/nhlbi_blazy/images/clear.png">Sleep is a period of rest that alternates with wakefulness. You have internal body clocks that control when you are awake and when your body is ready for sleep. These clocks have cycles of approximately 24 hours. The clocks are regulated by multiple factors, including light, darkness, and sleep schedules. Once asleep, you cycle through the stages of sleep throughout the night in a predictable pattern.<br> <br> Sleep is important because it affects many of your body鈥檚 systems. Not getting enough sleep or enough quality sleep raises your risk for heart and respiratory problems and affects your metabolism and ability to think clearly and focus on tasks.</p> <span data-embed-button="node" data-entity-embed-display="entity_reference:entity_reference_entity_view" data-entity-embed-display-settings="{"view_mode":"callout_descriptive"}" data-entity-type="node" data-entity-uuid="b9995677-ac83-425d-ae6b-e6165f58f3ca" class="align-center embedded-entity" data-langcode="en"> <article class="node node--type-callout node--promoted node--view-mode-callout-descriptive blue"> <div class="node__content"> <div class="component-callout-container component-callout-container-descriptive component-callout-container-descriptive-blue component-callout-container-descriptive-white callout-descriptive-with-image"> <div class="callout-descriptive"> <div class="callout-descriptive-image"> <div class="field field--name-field-callout-descriptive-image field--type-image field--label-hidden 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