What happens to the sleep counter when a sleeping Pokemon switches out?

Question

Pretty much the title. Does the game keep track of the sleep counter, or does it reset whenever a sleeping Pokemon re-enters battle?
I'm mainly asking in terms of a single battle, but if the game does keep track, then would it continue to do so even after the battle ends, or reset for the next battle (assuming the Pokemon is not awoken)?

Thank you in advance.

Answer 1

It resets to a number between 1 and 3

Answer 2

Generation VI onward
A Pokémon's sleep counter no longer resets to its original amount when switched out.

source

Comments

So gen VI onward, it keeps track?

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Yes. (12 characters)