While it's important to get a good night's sleep, the time just before bed is ideal for getting your thoughts together for the next day – and not just because it lessens what you have to do tomorrow. Scans of sleeping people show our brains work on solving problems when we're not awake, so reviewing a little work before bed helps imprint on your brain exactly what needs to be solved. "We've all had that aha moment in the shower the next morning," says Creswell. "That's because you've let the unconscious mind operate organically on the imprinted information." But avoid overly stressful projects before bed, which may cause you to toss and turn with worry. And don't work on anything with a screen within an hour of bed: Studies show the blue light in screens can lead to fitful sleep.