The most widely prescribed sleeping pills can cause strange behavior like driving and eating while asleep, the Food and Drug Administration said yesterday, announcing that strong new warnings will be placed on the labels of 13 drugs. Use of those medications and other similar drugs has soared by more than 60 percent since 2000, fueled by television, print and other advertising. Last year, makers of sleeping pills spent more than $600 million on advertising aimed at consumers. Sales in the United States of Ambien and Lunesta alone last year exceeded $3 billion. Last year ... some users of the most widely prescribed drug, Ambien, started complaining online and to their doctors about unusual reactions ranging from fairly benign sleepwalking episodes to hallucinations, violent outbursts, nocturnal binge eating and - most troubling of all - driving while asleep. Sleep-drivers reported frightening episodes in which they recalled going to bed, but woke up to find they had been arrested roadside in their underwear or nightclothes. The agency also received reports of people making phone calls, purchasing items over the Internet, or having sex under the influence of sleep medication. In each case the consumers had no recollection of the events, which they said had occurred after they took their pills and headed for bed. Hopefully this will make doctors think twice before blindly giving patients a prescription," said Dr. Mahowald. He also criticized marketing of the products. "I personally think the extent of advertising has just been unconscionable," he said.