“Burke and others published a pair of studies in 2016 using a protocol dubbed “sleep low,” which involved a high-quality carbohydrate-fueled workout in the late afternoon, followed by a carbohydrate-free dinner; then, the next morning, a carbohydrate-depleted moderate workout before breakfast.38 Repeating this cycle just three times, for a total of six days, produced a 3 percent improvement in 20-kilometer cycling times.”