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2. Melatonin - Wikipedia

   en.wikipedia.org/wiki/Melatonin

   Melatonin, an indoleamine, is a natural compound produced by various organisms, including bacteria and eukaryotes. [ 1] Its discovery in 1958 by Aaron B. Lerner and colleagues stemmed from the isolation of a substance from the pineal gland of cows that could induce skin lightening in common frogs.

3. Melatonin as a medication and supplement - Wikipedia

   en.wikipedia.org/wiki/Melatonin_as_a_medication...

   Melatonin, also known as N -acetyl-5-methoxytryptamine, is a substituted tryptamine and a derivative of serotonin (5-hydroxytryptamine). It is structurally related to N-acetylserotonin (normelatonin; N -acetyl-5-hydroxytryptamine), which is the chemical intermediate between serotonin and melatonin in the body.

4. Pineal gland - Wikipedia

   en.wikipedia.org/wiki/Pineal_gland

   It produces melatonin, a serotonin-derived hormone, which modulates sleep patterns following the diurnal cycles. [2] The shape of the gland resembles a pine cone , which gives it its name. [ 3 ] The pineal gland is located in the epithalamus , near the center of the brain, between the two hemispheres , tucked in a groove where the two halves of ...

5. Non-24-hour sleep–wake disorder - Wikipedia

   en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

   Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...

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   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

7. Free Online Card Games - No Downloads - AOL Games

   www.aol.com/games/card

   Enjoy classic board games such as Chess, Checkers, Mahjong and more. No download needed, play free card games right now! Browse and play any of the 40+ online card games for free against the AI or ...

8. List of freeware first-person shooters - Wikipedia

   en.wikipedia.org/wiki/List_of_freeware_first...

   This is a list of some of the most popular freeware and free and open-source software first-person shooter games. Realistic environments, fast arcade game play, many game modes. Single/Multiplayer. Improves AssaultCube. Single/Multiplayer. Science fiction, with single or multiplayer modes. Quake style multiplayer deathmatch.

9. Free Online Board Games - No Downloads - AOL Games

   www.aol.com/games/board

   Enjoy classic board games such as Chess, Checkers, Mahjong and more. No download needed, play free card games right now! Browse and play any of the 40+ online card games for free against the AI or ...