{"id":19399,"date":"2015-02-02T00:00:00","date_gmt":"2015-02-02T00:00:00","guid":{"rendered":"https:\/\/www.dreams.co.uk\/sleep-matters-club\/the-science-behind-why-alcohol-is-bad-before-bed\/"},"modified":"2024-06-07T16:45:45","modified_gmt":"2024-06-07T15:45:45","slug":"the-science-behind-why-alcohol-is-bad-before-bed","status":"publish","type":"post","link":"https:\/\/www.dreams.co.uk\/sleep-matters-club\/the-science-behind-why-alcohol-is-bad-before-bed","title":{"rendered":"The Science Behind Why Alcohol Is Bad Before Bed"},"content":{"rendered":"<p>Does drinking alcohol before bed make you sleepy? Many people swear by it, enough to ceremonially partake in a nightcap or two before crawling into bed.\u00a0In fact, scientists have shown that a little booze helps us <span style=\"color: #f197a7;\"><strong><a style=\"color: #f197a7;\" href=\"http:\/\/www.ncbi.nlm.nih.gov\/pubmed\/6155259\" target=\"_blank\" rel=\"noopener\">fall asleep faster<\/a><\/strong><\/span> and <strong><span style=\"color: #f197a7;\">increases slow-wave, or <\/span><span style=\"color: #f197a7;\"><a href=\"https:\/\/www.dreams.co.uk\/sleep-matters-club\/deep-sleep\">deep sleep<\/a><\/span><\/strong>, during the first half of the night.<\/p>\n<p>But it also affects other aspects of sleep, notably the second half of the night, which leaves much to be desired. What causes alcohol&#8217;s strange and dichotomous effect on the sleeping brain?<\/p>\n<p><iframe loading=\"lazy\" title=\"Does alcohol affect how we sleep? Episode 8 - Sleep Matters from Dreams podcast\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/1ili4WuDds8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<h2>Should\u00a0you have the nightcap or not?<\/h2>\n<p>Nathaniel Kleitman first\u00a0described how alcohol consumption affects body temperature and movement during sleep in healthy non-drinkers in his 1939 book <span style=\"color: #f197a7;\"><strong><a style=\"color: #f197a7;\" href=\"https:\/\/books.google.co.uk\/books\/about\/Sleep_and_Wakefulness.html?id=FwKzKM4sdEoC&amp;redir_esc=y\" target=\"_blank\" rel=\"noopener\"><em>Sleep and Wakefulness<\/em><\/a><\/strong><\/span>, written 15 years before his discovery of REM sleep. Kleitman noted that, compared to control subjects, those who drank alcohol before bed had a lower body temperature during the first half of the night. Halfway through, however, the alcohol drinkers&#8217; body temperature rose to above-normal levels. Body movement had a similar pattern\u2014below normal in the beginning of the night, with significantly more restlessness later on.<\/p>\n<p>In the early 1970s, Williams and Salamy began experimenting with different concentrations of alcohol and their effect on sleep. Participants were assigned to consume anything from one to six drinks, thirty to sixty minutes before bedtime. This is the time that\u00a0yields the peak blood alcohol concentration at lights-out. (A standard drink is defined as 350ml beer, 15ml wine, or 44ml of 80-proof distilled spirits).<\/p>\n<h2>The results<\/h2>\n<p>This yielded an interesting result: despite falling asleep more quickly, the subjects who consumed more alcohol before bed woke more frequently\u00a0and experienced lighter sleep during the second half of the night. Williams and Salamy identified this as being a <strong><span style=\"color: #f197a7;\"><a style=\"color: #f197a7;\" href=\"http:\/\/en.wikipedia.org\/wiki\/Rebound_effect\" target=\"_blank\" rel=\"noopener\">rebound effect<\/a><\/span><\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6466 size-full\" src=\"https:\/\/www.dreams.co.uk\/sleep-matters-club\/wp-content\/uploads\/nightcap-excerpt.jpg\" alt=\"Nightcaps are one of our seven sleep mistakes. Click the image for the rest.\" width=\"800\" height=\"592\" \/><\/p>\n<p><strong>Related:\u00a0<span style=\"color: #f197a7;\"><a style=\"color: #f197a7;\" href=\"https:\/\/www.dreams.co.uk\/sleep-matters-club\/7-sleeping-mistakes-infographic\">7 Sleep Mistakes You Don\u2019t Know You\u2019re Making and How to Fix Them<\/a><\/span><\/strong><\/p>\n<p>In other words, after the body metabolised and eliminated the alcohol, certain sleep variables reversed themselves. For example, too much slow-wave sleep during the first half of the night suddenly transitioned into <em>too little<\/em>. This manifests as disturbed sleep.<\/p>\n<p>The idea behind the rebound effect is that the body initially adjusts for alcohol&#8217;s effects in order to maintain normal sleep during the first half of the night. But even after the body metabolises alcohol halfway through the night, it\u00a0stubbornly continues to adjust, ultimately overcompensating and resulting in sleep disruption.<\/p>\n<p>But what exactly\u00a0is adjusting, and what&#8217;s causing the rebound effect? The short answer is, nobody really knows the whole story, because what occurs during sleep is not fully understood. But, neurochemically, we have some theories.<\/p>\n<h2>Gamma-aminobutyric acid<\/h2>\n<p>When you take a swig of alcohol, it goes right into the bloodstream. As such, it&#8217;s in your brain within minutes. Alcohol mimics gamma-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the brain. When bound to a GABA receptor on a neuron, alcohol allows either the influx of negative (or efflux of positive) ions, giving the cell a more negative charge. Thus, the neuron&#8217;s attempt to fire an action\u00a0response is stunted.<\/p>\n<p>Similarly, alcohol also\u00a0inhibits\u00a0the brain&#8217;s major excitatory neurotransmitter, glutamate, by blocking the function of its receptors. Since glutamatergic and GABAergic neurons <strong><span style=\"color: #f197a7;\"><a style=\"color: #f197a7;\" href=\"https:\/\/www.google.co.uk\/books\/edition\/Basic_Neurochemistry\/Af0IyHtGCMUC?hl=en&amp;gbpv=1&amp;dq=90%25+of+neurons+in+brain+glutamate&amp;pg=PA268&amp;printsec=frontcover\" target=\"_blank\" rel=\"noopener\">comprise 90% of all brain cells<\/a><\/span><\/strong>, this is a pretty big deal.<\/p>\n<p>Alcohol also enhances the ability for GABA to re-enter the neuron. But, perhaps even more detrimental, GABA (inhibitory) is recycled into glutamate (excitatory) in a continuous, viscous cycle. This means that the brain is constantly battling to relax and wake up, when you drink alcohol before bed.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6469\" src=\"https:\/\/www.dreams.co.uk\/sleep-matters-club\/wp-content\/uploads\/sleeping-after-party.jpg\" alt=\"Notice that you have bad sleep after a party? Read why at The Sleep Matters Club. \" width=\"800\" height=\"534\" \/><\/p>\n<p>The theory is that GABA dominates the first half of the night, after an evening of drinking, allowing us to fall asleep deeply. But once GABA metabolises, much of it has been transformed into glutamate. Glutamate-releasing brain regions like the reticular activating system\u2014which, among other things, regulates sleep, waking and arousal\u2014are likely to be where the midnight disruptions kick in.<\/p>\n<p>Should you partake in a night of hard drinking and expect a good night&#8217;s sleep? No way. But the real question&#8230;<\/p>\n<h2>Is one drink before bed going to affect sleep\u00a0<em>that<\/em>\u00a0much?<\/h2>\n<p>Try to avoid drinking alcohol four to six hours before you plan to go to sleep, as while some people find drinking alcohol helps them fall asleep more easily, alcohol has a negative impact on sleep quality throughout the night.<\/p>\n<p>So keep the drink small, and keep it early. Sleep now, wine later!<\/p>\n<p>For more advice, read <a href=\"https:\/\/www.drinkaware.co.uk\/facts\/health-effects-of-alcohol\/lifestyle-effects\/alcohol-and-sleep\">Alcohol and Sleep.<\/a><\/p>\n<p>&nbsp;<\/p>\n<div style=\"height: 100px; overflow-y: scroll; border: 1px solid #eee;\">\n<p><strong>\u00a0<\/strong><\/p>\n<h3>References<\/h3>\n<p>&nbsp;<\/p>\n<p>Roehrs T, Roth T. 2001. Sleep, sleepiness, sleep disorders and alcohol use and abuse. <em>Sleep Med Rev<\/em> 5(4):287-97.<\/p>\n<p>Stone BM. 1980. Sleep and low doses of alcohol. <em>Electroencephalogr Clin Neurophysiol<\/em> 48(6):706-9.<\/p>\n<p>Williams H, Salamy A. Alcohol and sleep. In: Kissin B, Begleiter H, eds. <em>The Biology of Alcoholism.<\/em> New York: Plenum Press, 1972. Pp. 435-83.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Does alcohol make you sleepy? Many people swear by it\u2014enough to ceremonially partake in a nightcap or two before crawling into bed.<\/p>\n","protected":false},"author":219,"featured_media":16082,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","inline_featured_image":false,"footnotes":""},"categories":[1,28],"tags":[],"class_list":["post-19399","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-problems-sleeping","category-sleep-science"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Science Behind Why Alcohol Is Bad Before Bed<\/title>\n<meta name=\"description\" content=\"What happens to your body when you drink alcohol before bed? 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