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Another lucrative one-page site is SleepCalculator.com, which assists users in determining optimal wake-up times based on their sleep cycles. This user-friendly interface sees about 1.41 million visits per month. Given its focus on sleep—an area ripe for advertising by mattress and sleep companies—the site benefits from a higher revenue per visitor, estimated at $20 per 1,000 visits. Ultimately, this website is netting around $28,000 monthly.