Sleep Cycle

Topics: Sleep, Circadian rhythm, Sleep disorder Pages: 5 (2114 words) Published: May 11, 2011
It's natural to blame sleep problems on stress or physical changes that come with age. But many cases of either sleeplessness or poor sleep are caused by a handful of specific problems, most of them fixable with lifestyle changes or the help of a doctor. Here, five little-known causes of sleep problems and what to do about them. 1. Light

How it disrupts sleep: You probably already know that when you stay up late under bright lights, you interrupt your body's natural sleep-wake cycle, because light tricks your brain into remaining in daylight mode. Less well known is that the light from computer screens and iPads shining directly into your eyes at close range is especially troublesome. Why? Part of the problem is that the light from these devices is at the blue end of the spectrum, which scientists believe is particularly disruptive to circadian rhythms. Blue light, although common during the day, doesn't occur naturally during the evening. Similarly, light shining in your eyes while you sleep -- even very small amounts coming from, say, a lighted clock -- makes your brain think it's morning and emerge out of deep sleep. Darkness triggers production of the hormone melatonin, the hormone that triggers sleepiness and the onset of sleep. Light prevents this release or shuts it off. The evidence: Studies have long shown that shift workers and those who work late at night have poorer sleep and higher incidences of certain conditions associated with lack of sleep than those who regularly sleep eight or nine hours at night. A recent study published in Cancer Causes & Control, for example, found that the countries generating the most light at night have the highest incidence of breast cancer. And studies at the Light Research Center at Thomas Jefferson University in Philadelphia have found that the use of computers, lighted readers, and TVs at close range is tied to a higher incidence of sleeplessness. Who's at risk: Everyone exposed to light shortly before bed or during sleep. Light is also bad for hearts, which need deep sleep to recharge. Surprising fact: Every year there's a spike in the number of heart attacks just after the start of daylight savings time in the spring. What to do: Dim the lights and turn off all lighted screens at least an hour before bed. If you use a reading light, make sure it's not any brighter than necessary and doesn't shine in your eyes. Do a "light police" room check: Are there streetlights outside your windows? Use blackout curtains or shades and make sure they fit the windows tightly so no light seeps in around the edge. Charge laptops, phones, cameras, and other devices in another room. Use an alarm clock without a lighted dial, or turn it to face the wall. Keep a flashlight next to your bed and use it whenever you have to get up to use the bathroom or let the dog out -- and be careful to point it away from yourself so you don't look into the beam. Don't turn on an overhead light, and never use nightlights. If you must use a laptop, turn down the screen brightness as low as you can tolerate and prop the laptop as far away from you as your typing arms will reach. If you love eReaders, try a Kindle or other device with a screen that's not backlit. 2. Pain

How it disrupts sleep: Just about any kind of pain signals sent by the brain -- jaw pain, headaches, back pain, or arthritis, for example -- disrupt sleep, lifting you from the deep, restful REM cycle into lighter sleep or causing you to sleep fitfully and partially wake up over and over, which experts call "microarousals." The evidence: Surveys of chronic pain sufferers reveal that between 60 and 90 percent sleep poorly. But many don't realize that their pain is the cause of their poor sleep. "This can become a vicious cycle," says Thomas Roth of the Sleep Disorders and Research Center at the Henry Ford Hospital in Detroit, because "even partial sleep disruptions can increase sensitivity to pain." In other words, even mild pain causes poor...
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