{"id":8598,"date":"2019-05-22T16:09:27","date_gmt":"2019-05-22T16:09:27","guid":{"rendered":"http:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nrem_sleep\/"},"modified":"2019-05-22T16:09:27","modified_gmt":"2019-05-22T16:09:27","slug":"nrem_sleep","status":"publish","type":"post","link":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nrem_sleep\/","title":{"rendered":"NREM sleep"},"content":{"rendered":"<p>Abbreviation for &#8216;non-rapid-eye movement sleep&#8217;, also referred to as quiet or inactive sleep, and one of the five EEG stages. &nbsp;The period of NREM sleep, taking up about 75% of sleep time and lasting from four to six hours, consists of four such stages (which stages 3 and 4 combined since 2007). &nbsp;Stage 1, occurring at the beginning of sleep and accompanied by slow eye movements, lasts for five to ten minutes as the person falls to sleep. &nbsp;EEG recordings show that the alpha <a href=\"http:\/\/www.medicine.mcgill.ca\/physio\/vlab\/biomed_signals\/eeg_n.htm\" class=\"cc-route-enabled\" target=\"_self\" data-editable-link=\"http:\/\/www.medicine.mcgill.ca\/physio\/vlab\/biomed_signals\/eeg_n.htm&amp;target=_self\" rel=\"noopener noreferrer\">waves<\/a> of wakefulness disappear and are replaced by theta waves. &nbsp;In the transition from wakefulness to Stage 1 <a href=\"http:\/\/bodyodd.nbcnews.com\/_news\/2012\/05\/22\/11798886-why-do-we-twitch-as-were-falling-asleep?lite\" class=\"cc-route-enabled\" target=\"_self\" data-editable-link=\"http:\/\/bodyodd.nbcnews.com\/_news\/2012\/05\/22\/11798886-why-do-we-twitch-as-were-falling-asleep?lite?target=_self\" rel=\"noopener noreferrer\">hypnic jerks<\/a> may be evident. &nbsp;In Stage 2, there are no eye movements, heart and body temperature decrease, and the sleeper can be easily awakened. &nbsp;EEG reveals patterns of <a href=\"http:\/\/www.jneurosci.org\/content\/31\/49\/17821.full\" class=\"cc-route-enabled\" target=\"_self\" data-editable-link=\"http:\/\/www.jneurosci.org\/content\/31\/49\/17821.full&amp;target=_self\" rel=\"noopener noreferrer\">sleep spindles<\/a> and <a href=\"http:\/\/behavenet.com\/k-complex\" target=\"_self\" data-editable-link=\"http:\/\/behavenet.com\/k-complex&amp;target=_self\" rel=\"noopener noreferrer\">K-complexes<\/a>. Stage 3\/4 is classified as deep or slow-wave sleep, with the typical delta waves now dominating. &nbsp;During this stage dreaming can occur, but is much less than during REM sleep. &nbsp;Dreams during NREM sleep are brief, less likely to involve visual images relative to REM sleep, and subject to forgetting. &nbsp;Up to the age of about 6 months, infants begin sleep with a period of REM sleep, but after this age the onset of sleep assumes the adult form with NREMs. &nbsp;&nbsp;<\/p>\n<p>See <a href=\"active_sleep\">Active sleep<\/a>, <a href=\"behavioral_state\">Behavioral state<\/a>, Electroencephalography (EEG), <a href=\"eeg_stage_1_sleep\">EEG stage 1 sleep<\/a>, <a href=\"rem_sleep\">REM sleep<\/a>, Sleep-wake cycle, Wakefulenss<\/p>\n<p><\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Abbreviation for &#8216;non-rapid-eye movement sleep&#8217;, also referred to as quiet or inactive sleep, and one of the five EEG stages. &nbsp;The period of NREM sleep, taking up about 75% of sleep time and lasting from four to six hours, consists of four such stages (which stages 3 and 4 combined since 2007). &nbsp;Stage 1, occurring &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/nrem_sleep\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;NREM sleep&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-8598","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-glossary","entry"],"_links":{"self":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8598","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/comments?post=8598"}],"version-history":[{"count":0,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8598\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/media?parent=8598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/categories?post=8598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/tags?post=8598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}