An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Sleepiness
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Often a general lack of energy, even after an adequate night time sleep caused mainly by boring college classes or nothing to do. It is very common to young adults and teenagers.
Sleepiness meaning & definition 1 of Sleepiness.
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the feeling of being tired and wanting to sleep:
Sleepiness meaning & definition 2 of Sleepiness.
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