Changing hospital lighting so that it follows a natural light-dark cycle could help patients sleep better and experience less pain, a small new study suggests.


Researchers from the Cleveland Clinic found that the lack of fluctuation between low light and bright light -- like a typical sleep-wake cycle, where it's bright during the day and dark in the night -- in hospitals is linked with poor sleep, more fatigue and more pain among patients.


For the study, published in the Journal of Advanced Nursing[1] , researchers examined the light exposure and sleeping patterns of 23 women and 17 men who were admitted to a hospital between May 2011 and April 2012. Researchers followed the light exposure, mood and pain levels of the patients for 72 hours each.


Patients in general got fragmented sleep, and just 236.35 minutes (about four hours) of shuteye, on average, each night. An association was found between fatigue and bad mood and low light exposure, while pain levels were linked with fatigue.


Meanwhile, "higher light exposure was associated with less fatigue and lower total mood disturbance in participants with pain, suggesting the need for further investigation to determine if manipulating light exposure for medical inpatients would be beneficial in affecting sleep–wake disturbances, mood and pain," the researchers wrote in the study.


Study researcher Esther Bernhofer, Ph.D., RN, of the Cleveland Clinic, said in a statement that future studies are needed to "determine if lighting interventions could offer unique, cost-effective ways to more effectively address the problems of sleep-wake disturbances[2] , distressed mood, and pain in hospitalized patients, providing for overall better patient outcomes."


It's not just hospital patients whose sleep is being hurt by light [3] -- a recent perspective in the journal Nature pointed out that electric lighting could negatively affect sleep of the population at large.



Also on HuffPost:




Loading Slideshow...



  • Every once in a while you have a bad night's sleep and you know exactly why: You found yourself at the<a href="http://www.huffingtonpost.com/2012/03/08/caffeine-sleep-morning-people_n_1314821.html" target="_blank"> coffee maker at 4 p.m.</a> or there were sirens blaring outside your window all night or maybe your <a href="http://www.huffingtonpost.com/2013/05/07/seasonal-allergies-sleep_n_3149119.html" target="_blank">allergies</a> are <em>killing</em> you. But more often than not the reasons behind your less-than-satisfactory slumber remain a mystery and you slog through the day with the unpleasant memory of your alarm clock's siren close at hand. We're shining a light on some of the most surprising reasons you can't sleep. Some of them you can't control, but some of them require only the tiniest of tweaks to help you hit the hay in no time.




  • You Slept In Saturday And Sunday


    We've all been tempted to spend some extra time in bed on a Saturday or Sunday morning (or both, whoops!), but experts say that sleeping late on the weekend (and staying up late, too) can be a bad idea -- for reasons other than productivity. Adjusting your <a href="http://www.huffingtonpost.com/2012/11/06/election-night-affects-sleep_n_2079015.html" target="_blank">wakeup time</a> can throw off your biological rhythms so drastically that your body feels like it traveled across time zones, and when it comes time to drift off Sunday night, this so-called <a href="http://www.huffingtonpost.com/2012/05/11/social-jet-lag-weekend-harm-health_n_1507396.html" target="_blank">social jet lag</a> likely won't let you fall asleep without a fight.




  • It's A Full Moon


    No, you're not turning into a werewolf. But the <a href="http://www.huffingtonpost.com/2013/07/29/full-moon-sleep-problems_n_3654323.html" target="_blank">lunar cycle does seem to have some effect on our sleep</a>, at least according to a small study. Researchers found that during the nights around a full moon, people get less deep sleep, less total sleep and took about five extra minutes to fall asleep.




  • Your Room Is Too Cold -- Or Too Hot


    You might think you know what makes for a cozy bedroom, but there's actual research examining optimal sleeping temperature. Generally, the sweet spot is somewhere <a href="http://www.huffingtonpost.com/dr-christopher-winter/best-temperature-for-sleep_b_3705049.html" target="_blank">between 60 and 67 degrees Fahrenheit</a>, Dr. Christopher Winter wrote in a recent blog for HuffPost, with temps below 54 or above 75 deemed disruptive to your slumber.




  • You're Not Wearing Socks


    Even if you've set the thermostat correctly, some people are just disposed to having colder than comfortable extremities. But this can become a problem at bedtime, since warm hands and feet are part of a delicate thermoregulatory dance that seems to <a href="http://www.nature.com/nature/journal/v401/n6748/full/401036a0.html#B1" target="_blank">predict how quickly you'll fall asleep</a>, according to a 1999 study. Speed up the process by <a href="http://www.oprah.com/health/Reasons-You-Cant-Sleep-Surprise-Sleep-Disruptors" target="_blank">pulling on a pair of clean socks before climbing into bed</a>.




  • It's Too Quiet


    Yes, you want your sleep sanctuary to be calm and quiet, but complete silence can lead to problems. If your room is <em>too </em>quiet, <a href="http://www.prevention.com/health/sleep-energy/10-reasons-you-cant-sleep/8-you-can-hear-pin-drop#ixzz2bU89J8jR" target="_blank">every little "inconsistency of sound" becomes that much more evident and disruptive</a>, Thomas Roth, Ph.D., director of the Sleep Disorders and Research Center at Henry Ford Hospital in Detroit, told Prevention. A <a href="http://www.huffingtonpost.com/2012/08/17/block-out-noise-sleep_n_1796575.html" target="_blank">white-noise machine</a> can help!




  • You're Afraid Of The Dark


    You may be too proud to admit it (even to yourself), but try to be completely honest for a minute: Are you afraid of the dark? <a href="http://healthyliving.msn.com/health-wellness/sleep/the-shocking-reason-you-can%E2%80%99t-sleep" target="_blank">Fear of the dark could actually be messing with your shut-eye</a>. In research presented at the 2012 SLEEP conference, people who reported themselves to be "bad sleepers" were found to get more anxious and more easily startled by noises once the lights went off than people who considered themselves "good sleepers", MSN reported. The researchers posited that bedtime anxiety that's often chalked up to knowing a night of fitful sleep awaits may actually be due to a legitimate and untreated phobia.




  • You Ate Steak For Dinner


    Just about everybody knows that caffeine too close to bed can keep you up -- and that you can get that same perk from more than just coffee or tea (dark chocolate is a common culprit!). But there are other lesser-known sleep-stealing foods and beverages, including fatty foods, spicy foods and protein. A big steak dinner, for example, takes a lot of digesting, and <a href="http://www.huffingtonpost.com/2013/02/26/worst-foods-for-sleep_n_2760746.html" target="_blank">your body isn't meant to be working that hard while it's sleeping</a>, Kelly Glazer Baron, Ph.D., M.P.H, a sleep researcher and neurology instructor at Northwestern University's Feinberg School of Medicine, told HuffPost in February. Asking your body to process a protein-heavy, late-night meal is asking to watch the clock.




  • You're Exhausted


    It's been a long day (or week) and you're feeling stretched to your limits. All you want to do is get into your bed, and you practically have to drag yourself into it. But despite that overwhelming exhaustion, you find yourself annoyed while counting sheep. What gives? "There's actually a big difference between being exhausted and being sleepy," Roth told WebMD. Your body is still on high-alert, even though you can hardly carry on, whether it's because of stress or physical activity. Long story short, <a href="http://www.webmd.com/sleep-disorders/features/6-surprising-sleep-wreckers?page=3" target="_blank">rushing to bed doesn't equate to rushing to sleep</a>. No matter how exhausted you feel, it's a good idea to wind down calmly and quietly first.




  • You Share A Bed


    We know, we know -- you love to snuggle. But <a href="http://www.huffingtonpost.com/2013/06/19/sleep-mistakes_n_3461583.html#slide=2584996" target="_blank">allowing a pet in the bed is asking for trouble </a>falling asleep. Every time Fluffy makes a move or a sound, you'll toss and turn right along with her, not to mention she drags with her allergy-triggering animal dander that you're better off keeping outside the bedroom. And it's not just furry friends that cause problems. Sharing a bed with a partner who tosses and turns or kicks or snores can give you just as much trouble falling asleep. One study found that <a href="http://news.bbc.co.uk/2/hi/8245578.stm" target="_blank">when sharing a bed, couples experience 50 percent more sleep disturbances</a> than when sleeping solo, the BBC reported. Separate beds may be catching on -- a recent report from Toronto found that <a href="http://www.huffingtonpost.com/2013/08/07/sleep-study_n_3721615.html" target="_blank">30 to 40 percent of couples sleep apart.</a>