Tonight in the United States, clocks are moved ahead by one hour (thus losing sleeping time).
According to WebMD:
In general, "losing" an hour in the spring is more difficult to adjust to than "gaining" an hour in the fall. It is similar to airplane travel; traveling east we lose time. An "earlier" bedtime may cause difficulty falling asleep and increased wakefulness during the early part of the night. Going west, we fall asleep easily but may have a difficult time waking....
So there may be some tired and groggy people hitting the streets Monday morning, in the dark. Interestingly, some studies show an overall reduction in traffic accidents and fatalities due to daylight-saving time changes. However, one study showed a significant increase in accident rates on the Monday following daylight-saving time. The author attributed sleepiness as a cause. I am not sure exactly which way to go on this one, but maybe you may want to just sit back and have another cup of coffee -- decaf, of course -- and go in to work a bit later, when the sun is up?