People around the globe are taking to social media, flaunting their latest badge of distinction—membership in The 5 a.m. Club. It’s inspired by a challenge from best-selling author and motivational speaker Robin Sharma to wake up at 5 a.m. for 66 days to develop habits for greater productivity. “Join The 5 a.m Club. Your most valuable hours are 5 a.m. – 8 a.m. They have the least interruptions,” he says. Benjamin Franklin, Thomas Jefferson, Apple’s CEO Tim Cook, and dozens of other successful leaders past and present are known for using this special time of day to exercise, plan, meditate,…