Lots of people set the alarm with the best of intentions, knowing that’s the time they need to get up to meet the day’s demands. But then the alarm clock seems to ring far before they’re ready to rise, so they’re hitting snooze and, eventually, running late. Something’s got to give. The key lies inside your body. “An important factor in being able to wake up easily at the desired time in the morning is the timing of one’s circadian rhythm, or ‘body clock,’ ” says sleep researcher Leon C. Lack, PhD, a professor in the school of psychology at Flinders University in Adelaide, Australia. Much of what you need to do to wake up on time starts by planning your sleep schedule the day and the evening before – and by making your mornings count.