No matter what time you wake up – wait 90 minutes – THEN have coffee. Psychologist Steven Miller is from BrainFacts.org – and he says when you wake up, your stress hormones will start rising. So drinking coffee right out of the gate is a waste of good caffeine. Because we’re already on a natural cortisol upswing, so you won’t feel the energy boost. But after 90 minutes, those stress hormones will start leveling off. That’s when a dose of caffeine will pay off, raising your energy levels back up again. So remember, wake up time – plus 90 minutes – equals coffee.