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Sleep Mate 580A By Marpac Over 45 years ago, the original Sound Screen / Sleep Mate sound conditioner white noise machine was developed because the inventor was having trouble sleeping. It worked so well, he made it available to his friends and family and ultimately the world. Today, the Sleep Mate is still the most economical, most popular white noise machine and sound conditioner on the market. This white noise machine and sound conditioner creates a...