|
Page 1 of 2
Twenty percent of Americans sleep less than six hours a night, and nearly one-third have lost sleep worrying about financial concerns, according to the National Sleep Foundation, which recommends that adults get seven to nine hours. 'Our society thinks sleep is for slackers -- or suckers,' says Darrel Drobnich, the organization's chief program officer.
But all that lost sleep is taking an insidious toll. Chronic, inadequate sleep raises the risk of cardiovascular disease, depression, diabetes and obesity. It impairs cognitive function, memory and the immune system and causes more than 100,000 motor-vehicle accidents a year. Sleep deprivation also changes the body's metabolism, making people eat more and feel less satisfied.
Studies presented at the American Association of Sleep Medicine's annual meeting in Seattle recently also found that inadequate sleep is associated with lower GPAs among college students and with elevated levels of visfatin, a hormone secreted by belly fat that is associated with insulin resistance.
What many people don't realize is that even if they log respectable time in bed (known as TIB among sleep researchers), they may be getting poor-quality sleep, with not enough of the restorative phases. REM, the Rapid Eye Movement phase in which dreaming occurs, is crucial for consolidating memories, learning, creativity, problem-solving and emotional balance. Deep, or slow-wave sleep, when the body secretes human growth hormone, is critical for development and physical repair. Both REM and deep sleep decline with age and are highly vulnerable to disruptions, from caffeine and alcohol to anxiety and a variety of sleep disorders.
One tip-off that you haven't gotten enough restorative sleep is trouble waking up and excessive daytime sleepiness (a condition known as EDS). 'People say, 'Oh, I don't have a sleep problem. I can fall asleep anywhere, anytime' -- but that means you are excessively sleepy,' says Charles Czeisler, a professor of sleep medicine at Harvard Medical School.
Other symptoms of sleep deprivation include mood changes, difficulty focusing or remembering and a chronic need for caffeine, which c an then create a vicious circle of dependence and disruption. That would be me.
Finding out what's going on in your sleep generally requires spending the night in a professional sleep lab hooked up to lots of wires and monitors. But I've been testing a new home-sleep monitor called the Zeo Personal Sleep Coach that lets people track their sleep patterns nightly in their own bedrooms.
You sleep wearing a soft headband with sensors that monitor your brain waves and send signals wirelessly to a device that looks like a sleek clock radio. It displays whether you are awake or in light sleep, deep sleep, or REM sleep, in real time, all through the night.
'If you can measure it, you can manage it,' says Stephan Fabregas, one of two recent Brown University graduates who invented the Zeo because they were looking for a way to wake up feeling less groggy after late nights.
I knew I wasn't getting enough TIB, but I was stunned to see how little of my time in bed I was actually asleep. The Zeo showed that I woke up numerous times and was awake for long stretches of the night, without having any recollection. (Perception of time is often distorted at night -- many people with insomnia actually sleep more than they think they do.) Even though I was in bed for six or seven hours each night, I was averaging only about four hours of real sleep and very little REM or deep sleep. No wonder I feel so tired!
The Zeo stores the information on a memory card you can upload to a Web site, which helps track your sleep patterns and sends daily coaching tips for getting better sleep. The $399 device comes with six months of daily email coaching, which can be extended at a cost of $99 for each additional six months. (Currently, it's available only online at www.myzeo.com.)
To help you keep track of your sleep, the Zeo also gives you a 'ZQ' score every morning, based on the quantity and quality of your sleep the night before. There's no ideal ZQ -- you're comparing your own score from night to night. But the average for people in their 20s is 86; for those in their 40s, it is 74; and for those in their 50s, it is 67, since sleep quality declines with age.
My ZQs bounced from the 40s to a dismal 15 the first week. Switching to decaf after 3 p.m. and making an effort to get to bed earlier helped me bring my score into the 50s the second week. ('Having caffeine even first thing in the morning can induce changes in brain activity during sleep,' says Kenneth Wright, director of the Sleep and Chronobiology Lab at the University of Colorado at Boulder and one of Zeo's scientific advisers.) I also noticed that the nights when I had the longest stretches of wakefulness were those when my column was due -- probably a sign that I was still thinking about it long after turning in.
|
