Falling back has its downsides. From Weathersphere.
While you might look forward to that extra hour of sleep you get when daylight saving time ends, setting your clocks back an hour during the fall can have more negative effects than you realize. With a bit of planning, you can reduce the effects of “falling backwards” and actually spring into the coming season without major disruptions to your routines.
It’s Harder to Wake Up
When our eyes see light (historically sunlight), our brain produces serotonin, which helps us stay awake and feel refreshed. When our eyes see darkness, the brain reduces production of serotonin and secretes more melatonin, which makes us sleepy and helps us get into a deeper sleep. If you’ve been waking up in a room with sunlight streaming in each morning, you probably wake up ready to face the day. If you get the exact same amount of sleep but wake up in a pitch-dark room, you’re often ready to punch your alarm clock, reluctantly drag yourself out of bed, and stomp off the to bathroom, mumbling, stumbling and groaning until enough light hits you to help you start waking up.
Waking up tired can lead to sleeping longer on the weekends, which can lead to lethargy the rest of the day, and possibly weight gain. If you have more trouble getting out of bed in the winter, consider buying a sleep lamp you set like an alarm clock. At a time you predetermine, the light slowly begins to increase in brightness, helping you get out of the deeper sleep pattern that makes it difficult to wake up.