Getting an extra hour of rest sounds awesome, but it also means leaving the office when it's basically dark out. Adjusting to the new time change may take up to a week to get used to. It can mess with your circadian rhythm - the internal clock that controls sleep, energy, and even hunger. A 2013 study suggests that during autumn transition, people tend to get up earlier and lose time sleeping overall. Moreover, studies show a slight uptick in heart attacks to and from daylight saving time. The good news: If you follow the right strategies, you can adjust to the change in a day or less.