Not Sleeping? 9 Ways It Could Be Your Bedroom's Fault

Shades of blue are the best for sleep, as they promote longer slumber, according to Brantner. "The ganglion cells in our eyes help send our brain info that regulates our circadian rhythm, and those cells are sensitive to blue," he says. "Blue is also associated with calmness, which can help reduce your heart rate and blood pressure to get you to sleep." Of course, blue isn't for everyone, so other suitable options include greys and similar neutral hues. "While people say red stimulates passion, I'd do my best to stay away from any harsh colors," he adds.

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