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Why is it so difficult to fall asleep when you are overtired? | Popular Science
The difference between tiredness and sleepiness
Generally, people fail to distinguish between fatigue-physical tiredness and sleepiness, the inability to stay awake.
It's possible to feel tired physically and still be unable to fall asleep, simply because you don't feel sleepy.
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Calming a misophonic brain
There's a lot of similarity between people who experience misophonia, but also a lot of diversity.
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Removing caffeine from coffee
Coffee beans are first softened in hot water or steam. Then caffeine is dissolved from the beans by using a solvent such as methylene chloride, ethyl acetate, or a gentler solvent such as w...
Adding flavour molecules
The solvents used to obtain decaf coffee also remove some of the flavour molecules. These are then added back.
One way is to perform a first extraction with water, then shake up the water with a small volume of methylene chloride, or pass it through a charcoal filter. Both processes selectively remove the caffeine from the water but leave most of the flavour molecules.