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2. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

   www.aol.com/entertainment/20-off-raycon-earbuds...

   These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

3. 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]

4. Imaginary number - Wikipedia

   en.wikipedia.org/wiki/Imaginary_number

   An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i2 = −1. [1][2] The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]

5. Calm (company) - Wikipedia

   en.wikipedia.org/wiki/Calm_(company)

   The app features both meditation tools and sleep aids. The meditation area offers breathing exercises, a daily meditation, several multi-day programs, and unguided and guided meditation sessions. [19] [20] The company also produced a nature documentary series for HBO Max. [21] [22]

6. A complete guide to the very best Labor Day sales on ... - AOL

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   The Best Labor Day Sales this year includes great deals such as a $65 mattress, a $20 set of sheets and 20% off Amazon bestselling pillows. Browse all of the deals available this Labor Day.

7. 20 (number) - Wikipedia

   en.wikipedia.org/wiki/20_(number)

   Twenty is a pronic number, as it is the product of consecutive integers, namely 4 and 5. [3] It is also the second pronic sum number (or pronic pyramid) after 2, being the sum of the first three pronic numbers: 2 + 6 + 12. It is the third composite number to be the product of a squared prime and a prime (and also the second member of the 22 × ...

8. International Classification of Sleep Disorders - Wikipedia

   en.wikipedia.org/wiki/International...

   Sleep medicine. The International Classification of Sleep Disorders (ICSD) is "a primary diagnostic, epidemiological and coding resource for clinicians and researchers in the field of sleep and sleep medicine". [1] The ICSD was produced by the American Academy of Sleep Medicine (AASM) in association with the European Sleep Research Society, the ...

9. The best Lighting Deals to shop this Black Friday - AOL

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   45% off the I-box Dawn Alarm Clock Radio. 20% off the Levoit Air Purifier. 40% off the VacLife Handheld Vacuum. 35% off the REST Evercool Cooling Comforter. Best Black Friday Lightning Deals for ...