Many of us feel tired as we go about our daily lives. We sleep too little on some nights and then crash on others, a cycle that leaves us either exhausted or unable to maintain good routines. Since most adults have to wake at set times for work or family responsibilities, the only variable that can move is the time you go to bed. So give yourself a bedtime. Figure out how much sleep you need. Count back and embrace that time as the end of the day.