Americans are about to be reminded again how much they need sleep — and sleeping pills. A new effort appears to be developing to expand the use of sleeping pills, which because of their potential for abuse have long had a reputation as being in some ways more dangerous than the insomnia they are meant to treat. Some sleep experts say newer pills are safer than the ones that once caused deaths from overdose. Moreover, some say, there is growing evidence that insomnia is a serious medical condition, not just a nuisance. "Slowly, we are beginning to identify that insomnia...