This definition appears very rarely
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Samples in periodicals archive:
``For some people, over-the-counter sleeping aids are not appropriate, and they can prevent people from getting a prescription for a drug that may be more helpful,'' said Thomas Roth, chief of the sleep disorders and research center at Henry Ford Hospital in Detroit.
b) Women are twice as likely as men to use over-the-counter sleeping aids (18% of women use them compared to 9% of men).
households buy over-the-counter sleeping aids according to ACNielsen Homescan(R) consumer panel data.