Where I live there are two clear reminders that winter is coming soon. First, we've had a little bit of snow twice in the last five days. Second, this weekend we're setting our clocks back by one hour. If your state or province practices Daylight Saving Time, you'll be rolling back your clocks before bed and gaining back that hour of sleep you lost in the spring. Students may be wondering about the reasons for Daylight Saving Time. The following videos offer concise explanations of Daylight Saving Time.