Unfortunately, we were not designed to be members of a 24-hour society. We can't ignore millions of years of evolution and stay up all night and sleep all day.We function best with a regular pattern of sleep and wakefulness that is in tune with our natural environment. Nature's cues are what keep our body clocks ticking rhythmically and everything working in harmony. So, next time you think a daily routine is boring and predictable, remember that routine may well save your life in the long run.