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Hello, ever tried with a short siesta? When your brain is tired, nothing beats some sleeping. Some caffeine may follow.

I nap often (in the sun too). I find there's nothing quite like a stimulating activity though.

There's interesting research on caffeine-naps (or nappucinos). Empirically, these are useful--http://www.huffingtonpost.com/2014/09/03/coffee-sleep-power-...