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I run a number of side project sites and I do much of my work late at night.

I have one simple rule for myself - which is to never deploy anything at night before I go to bed. I've made several critical mistakes which I deployed to production and then went to bed only to wake up and find out that users couldn't use my products.

Thesedays, I do all deployment in the morning - that way, even if there is a critical bug, I am awake to catch it and fix it quickly.

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Generally a good idea, if you don't have a setup where everything is validated end-to-end before you go to production - which is most software, and even if you have end-to-end automated verifications there's still risks outside of that scope / vision. (a server may run out of hard disk space from the new code, to name something random).

Definitely. I have a similar policy about deploying late in the day on a Friday. Rushing to get something deployed before an arbitrary deadline is generally a bad idea. By all means, push hard to finish the feature and qa it thoroughly, etc., by whatever cutoff, but wait to hit that launch button until the next morning. Saves so much stress.

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