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As of December 31, 2023, approximately 287 million reviews have been contributed to Yelp. In 2023, the company had over 36 million desktop unique visitors and over 60 million mobile web unique visitors. Yelp estimates that over 55% of its audience has an annual household income of more than $100,000. [5]
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Light therapy can improve sleep quality, improve sleep efficiency, and extend sleep duration by helping to establish and consolidate regular sleep-wake cycles. Light therapy is a natural, simple, low-cost treatment that does not lead to residual effects or tolerance.
The SLEEP annual meeting of the Associated Professional Sleep Societies LLC (APSS) is a joint venture of the AASM and the Sleep Research Society. The meeting attracts about 5,000 attendees each year. Research abstracts from each SLEEP meeting are published annually in a supplement of Sleep, the peer-reviewed publication of the SRS. [10]
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Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.
The company manufactures the Sleep Number® bed, an adjustable air mattress.The "Sleep Number® setting" is a setting that adjusts the firmness or softness of the mattress on each side of the bed using air pressure (dual air chambers, one on each side), with higher numbers (up to 100) denoting higher pressure and more firmness, and lower numbers denoting less pressure and more softness.