Nootropic
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A drug designed to cure abnormal sleep disorder such as Insomnia/Narcolepsy. People who struggle to fall asleep at night or find it hard to keep themselves from sleeping anywhere comfortable are more prone to these drugs. Examples of Nootropics are elaborated here
https://www.healthmatter.co/product/waklert-150/Nootropic meaning & definition 1 of Nootropic.