Chronic insomnia is a major public health problem. And too many people are using__1__ therapies,even while there are a few treatments that do work. Millions of Americans __2__awake at night counting sheep or have a stiff drink or __3__an pill,hoping it will make them sleepy.__4__ experts agree all that self-medicating is a bad idea,and the causes of chronic insomnia remain__5__. Almost a third of adults have trouble sleeping,and about 10 percent have__6__ of daytime impairment that signal true insomnia. But __7__the complaints,scientists know surprisingly little about what causes chronic insomnia,its health consequences and how best to treat it,a panel of specialists __8__together by the National Institutes of Health concluded Wednesday. The panel called__9__a broad range of research into insomnia,__10__that if scientists understood its __11__causes,they could develop better treatments. Most,but not all,insomnia is thought to __12__other health problems,from arthritis and depression to cardiovascular disease. The question often is whether the insomnia came first or was a result of the other diseases and how trouble sleeping in__13__complicates those other problems. Other diseases __14__,the risk of insomnia seems to increase with age and to be more __15__among women,especially after their 50s. Smoking,caffeine and numerous __16__drugs also affect sleep. The NIH is spending about $200 million this year on sleep-related research,some__17__to specific disorders and others __18__the underlying scientific laws that control the nervous system of sleep. The agency was__19__the panel‘s review before deciding what additional work should be__20__ at insomnia. "^UJC-
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