The clock is ticking, time is passing, and few of us are getting any younger – well, make that none of us. But there are a number of ways to slow the hands of time. One of the easiest, and most direct, ways is to take advantage of the clock that’s built into every one of us -- the internal master clock, aka your circadian rhythm, which runs on a 24-hour cycle. That inner clock is what helps regulate when you feel sleepy or alert, when you’re hungry, and even how your body fights off illness.