Everyone’s fatigued—it’s one of the top medical complaints today—but changing these 13 habits could make you more energized. So get cracking!

By Laura Potter

You Need to Open the Window

The very air you breathe could be an issue. “Close the door, shut the window, add a partner and a heater, and by 3 a.m. a typical bedroom sits at 1,500 to 2,500 parts per million of carbon dioxide,” says Dr. Jemma King, author of Sleep First: Sleep Smarter, Think Sharper, Feel Better. “Research shows that above 1,000 ppm [parts per million] sleep efficiency drops, deep sleep reduces and salivary cortisol rises on waking. You’re sleeping, but your nervous system is mildly activated all night.” Luckily, it’s an easy fix: open a window – even three-quarters of an inch will do the job, according to King. READ ON