Most of us in North America moved our clocks forward by one hour last night or this morning. In doing so we will feel like or may actually have lost an hour of sleep. This is what happens every year when you live in a place that uses Daylight Saving Time. Your students may come to class on Monday morning complaining about their lost hour of sleep and be wondering about the reasons for Daylight Saving Time. The following videos offer concise explanations of Daylight Saving Time.