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2. These Smart Mattresses Will Seriously Up Your REM Cycle Game

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   The Saatva Solaire mattress has 50 different firmness levels—aka, way more than the three levels (soft, medium, hard) typically offered by most mattress brands. ... Sleep Number C2 Smart Bed ...

3. The 10 Best Mattresses for Couples (Even If You Two Can't ...

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   Nectar Sleep. Aside from the fact that this mattress scored 93 points out of 100 in a PureWow100 review, it’s also the best bang you’ll get for your buck (considering pricing starts at $349 ...

4. These Are the 11 Best Places to Shop for a New Mattress Online

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   Though Mattress Firm is a treasure trove of sleep essentials—selling a breadth of pillows, bed frames, and mattress—the retailer offers a 120-night trial across its inventory as well as a 10 ...

5. Sleep Number - Wikipedia

   en.wikipedia.org/wiki/Sleep_Number

   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.

6. Sleep cycle - Wikipedia

   en.wikipedia.org/wiki/Sleep_cycle

   Sleep cycle. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]

7. Sleep onset latency - Wikipedia

   en.wikipedia.org/wiki/Sleep_onset_latency

   A sleep onset latency of 0 to 5 minutes means severe sleep deprivation, 5 to 10 minutes is "troublesome", 10 to 15 minutes indicates a mild but "manageable" degree of sleep debt, and 15 to 20 minutes is indicative of "little or no" sleep debt. [1]: 341–342. In sleep science, sleep onset latency (SOL) is the length of time that it takes to ...