A variation upon a trope or story mechanic which, like an isotope of an atom, remains fundamentally the same as the normal version, but may behave very differently.
The name for variations of a literary trope, a "literary trope isotope".
Although dracula and edward are both vampire isotropes, the dracula isotrope is highly stable, while the edward isotrope has a tendency to decay into fanfiction and ghey
He sanitized his hands after touching any item, even if it had been sitting undisturbed on his desk for years. 'You can never be too careful', he said aloud, every few minutes, in denial of his isopropyl alcoholism.
Either liquid niquil or any liquid drink with melatonin, Ashwaganda or other sleeping aids in a liquid form. If warm tea helps you get to sleep that could be sleepy juice too.
I could not sleep so I chugged some sleepy juice and now I'm so tired and sleepy.