As the days get shorter, you may notice a decrease in your energy levels. With less hours of sunlight and, typically, more time spent indoors, you may not get enough natural light to keep you energized. What’s the answer? Expose yourself to the right light, both natural (when you can get it) and artificial. Every day, especially first thing in the morning, get some natural sunlight, since daylight contains energy-boosting short-wavelength blue light. Head outdoors or open your shades to let light in through the windows. To create energizing spaces for daytime, opt for whitish or bluish light, which are closest to daylight. Artificial blue light — the same type of light that glows from your phone and that, yes, can keep you up at night — has been shown to improve attention and alertness.