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This makes perfect sense, why downvotes? It's maybe not for everyone, but keeping a regular and consistent 'beat' works for most things.

Exactly. This is a much more sane and healthy approach than the whole sugar and coffee rhetoric, to say the least.

Coffee definitely won't affect your sleep if you have reasonable amounts and only in the morning.

Sleep apnea is a big thing. I haven't got there yet, but getting tested and starting to use a CPAP machine has been a huge improvement for my Dad.