Most of what we know about sleep and health comes from studies of what happens to the mind and body when we don't sleep enough, or at all. In animal and human studies, living without sleep for even a few months resulted in death. Sleeping fewer than 8 hours a night on a regular basis is associated with increased risk for diabetes, heart disease and stroke, depression, colds and flu, and obesity.
While We Are Sleeping…
Sleep affects brain chemistry and has an important role in the functioning of the nervous, immune and endocrine systems. During sleep we develop and reinforce neural pathways involved in memory, learning, and emotion. New research suggests sleep helps flush toxins from the brain.
While we are sleeping, the body manufactures hormones that repair damage caused by stress and the environment in which we work and play. Growth hormone cleanses the liver, builds muscle, breaks down fat, and helps normalize blood sugar. We also produce hormones that help fight infections. If we aren’t getting sufficient sleep, we get sick more often and take longer to recover. Lack of sleep increases inflammation, which has been linked to heart disease and stroke.
Skimping on shut-eye is linked with obesity in adults and children. Lack of sleep interferes with the levels of ghrelin and leptin, metabolic hormones that signal when you’re hungry and when you’re full.
The amount of sleep you need varies based on age, activity level, quality of sleep, and genetics (e.g., some of us really are night owls). Infants typically require 14-15 hours of sleep per 24-hour period; young children about 12 hours; teens about 9 hours, and most adults 7-9 hours. A general rule of thumb for determining your sleep requirement: If you do not wake feeling refreshed, you may not be getting enough sleep.
Tips For A Good Night’s Sleep
- In the sack for sleep and sex only. Regular sex can improve sleep quality so don’t use your time between the sheets to deal with daily hassles—take that outside of the bedroom (or record in a journal). If you don’t feel sleepy, leave the room and do something relaxing until you feel drowsy. Then, go back to bed.
- Set a sleep schedule. This includes a soothing pre-sleep routine, such as a warm bath, reading or gentle yoga. Go to bed and wake at the same time each day. This trains your body rhythms, making it easier to fall asleep. If you need a nap, get it in before 5:00 PM; limit to 20 minutes.
- Surround yourself with cave-like ambiance. A sleeping space should be quiet, dark, and cool (between 16-22°C). If you do shift-work, use blackout shades or an eye mask. Remove electronic devices, computers and TVs from your room. Research shows that use of digital devices within an hour of bedtime has a negative effect on sleep quality.
- Let the light in early and exercise regularly. Natural light helps regulates hormones that promote ideal sleep-wake patterns. Open the curtains as early as possible and get outdoors during the day. Also, exercise during the day or early evening makes it easier to fall asleep and increases the amount of deep sleep obtained.
- Eat a Light, Last Meal of the Day. A light dinner eaten 2-3 hours before sleep is ideal. A full stomach interferes with sleep as the body works at digestion. Steer clear of spicy or fatty foods that can cause heartburn. Avoid products containing caffeine, sugar or nicotine as their effects can last several hours.
Are You Sleep Deprived?
You don’t have to pull “all-nighters” to become sleep deprived. A sleep debt of just 1-2 hours a few nights a week can affect your health and performance.To become fully well-rested and regain energy after a sleep debt, get an extra hour of sleep each night for one week.
If you experience any of the following signs of sleep deprivation, talk to your healthcare provider about natural approaches to getting your sleep back on track.
- Daytime drowsiness; fatigue
- Poor memory; difficulty concentrating
- Changes in appetite
- Difficulty dealing with stress
- Muscle tension; impaired vision
- Increase in accidents or clumsiness
Harvard Health. Sleep: What’s in it for You? http://healthysleep.med.harvard.edu/need-sleep/whats-in-it-for-you/health
Strickgold, R. “Sleep on It!” Scientific American. October 2015. 313(4): pp. 52-57.
Brondel, L., Romer, M., Nougues, P., Touyarou, P., and Davenne, D. 2010. Acute partial sleep deprivation increases food intake in healthy men. American Journal of Clinical Nutrition 91 (6): 1550-1559.
National Sleep Foundation. 2009. How much sleep do we really need? http://www.sleepfoundation.org/article/how-sleep-works/how-much-sleep-do-we-really-need.
Chang, A., et al., Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences (Dec 2014). 112:4, 1232-1237. http://www.pnas.org/content/112/4/1232.full.pdf
Harvard Health. Consequences of Insufficient Sleep. http://healthysleep.med.harvard.edu/healthy/matters/consequences
Van Cauter, E. & Knutson, KL. “Sleep and the Epidemic of Obesity in Children and Adults.” European Jl of Endocrinology. 59(1) pp. S59-S66. http://www.eje-online.org/content/159/suppl_1/S59.short
Rechtschaffen, A. & Bergmann, BM. “Sleep Deprivation in the Rat: Update of the 1989 Paper.” Sleep. 2002. 25(1): pp. 18-24. http://www.journalsleep.org/Articles/250104.pdf
Knutson KL, et al. Role of Sleep Duration and Quality in the Risk and Severity of Type 2 Diabetes Mellitus, Archives of Internal Medicine. 2006 Sep 18; 166(16):1768.
Gottlieb DJ, et al. Association of Sleep Time with Diabetes Mellitus and Impaired Glucose Tolerance, Archives of Internal Medicine. 2005 Apr 25; 165(8): 863.
King, CR et al. Short Sleep Duration and Incident Coronary Artery Calcification, JAMA, 2008: 300(24): 2859-2866. http://www.ncbi.nlm.nih.gov/pubmed/19109114
Opp, MR, et al. Neural-Immune Interactions in the Regulation of Sleep, Front Biosci. 2003 May 1;8:d768-79.
Cohen S, et al. Sleep Habits and Susceptibility to the Common Cold, Arch of Intern Med. 2009 Jan 12; 169 (1):62-67.
Colten, HR & Altevogt, BM, eds. Sleep Disorders and Sleep Deprivation: An Unmet Public Health Problem. Institute of Medicine Committee on Sleep Medicine and Research. Washington, D.C.: National Academies Press 2006: 3. “Extent and Health Consequences of Chronic Sleep Loss and Sleep Disorders.” http://www.ncbi.nlm.nih.gov/books/NBK19961/
Spiegel K, et al. Impact of Sleep Debt on Metabolic and Endocrine Function, Lancet. 1999 Oct 23: 354(9188): 1435-9.
Zeng, Yawen et al. “Strategies of Functional Foods Promote Sleep in Human Being.” Current Signal Transduction Therapy 9.3 (2014): 148–155. PMC. Web. 16 Oct. 2015. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4440346/
Figueiro M, Bierman A, Plitnick B, Rea M. “Preliminary evidence that both blue and red light can induce alertness at night.” BMC Neuroscience. 2009;10(1):105.
National Sleep Foundation: Sleep Depression & Anxiety https://sleepfoundation.org/excessivesleepiness/content/the-complex-relationship-between-sleep-depression-anxiety
National Institutes of Health: Signs and Symptoms of Problem Sleepiness http://www.nhlbi.nih.gov/health/health-topics/topics/sdd/signs
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