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The Limits of Hachana
I'm trying to understand the limits of applying the concern of hachana on Shabbos. Here is one hypothetical:
I need to be up and alert right after Shabbos ends, and I know that a cup of coffee kicks in for me an hour after I drink it. So, though I'm not especially thirsty, I drink a cup of coffee 45 minutes before the end of Shabbos. I have done nothing which is forbidden on Shabbos but my actions are specifically for the benefit (impact) which will only exist post Shabbos. Is that hachana?

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