"Studies show that people who lack sleep have higher cortisol levels and are more prone to all kinds of illnesses, including cardiovascular disease," says Bark. "I love to nap in the summer outside. Lying in a hammock on a warm summer day, hearing the breeze rustling... It's so plush and indulgent and I love it, love it, love it."
Next: 3 yoga postures that can lengthen the life of your joints