Each November, we “fall back” by setting our clocks one hour earlier as Daylight Saving Time ends. While gaining an extra hour of sleep may sound like a bonus, the shift can still disrupt your body’s internal clock, especially if you’re already sleep-deprived.
Our circadian rhythm, which regulates sleep and wake cycles, is influenced by light exposure. When the clocks change, our exposure to morning and evening light shifts, which can affect sleep quality, mood, and alertness.

Times-Tribune

Raw Story
RadarOnline
NBC4 Washington
The Conversation
Psychology Today
Reuters US Business
Corpus Christi Caller-Times
CNN Politics