With the end of Daylight Saving Time at 2 a.m. Sunday, you'll also have to reset your internal clocks and adjust to gradually earlier sunsets until the Winter Solstice arrives on Dec. 21. In many Eastern Standard Time cities, it will start getting dark before many of you leave the office and start your evening commute, where dangers you may not be prepared for are lurking.

Experts say springing forward to daylight saving time, when we lose an hour, is harder on the body than falling back from it, when we get to languish in bed for one more luxurious hour of sleep or pack in another hour of fun with friends and family. Though you're not as likely to suffer a cardiac event in the fall as in the spring — true fact: a 2015 University of Michigan study showed a 25 percent surge in heart attacks on the first full day after the spring-forward to DST — the chances that something bad will happen during your commute go up dramatically. Here are some of them:

Increased Deer Collision Risk Photo by Lee Coursey via Flickr Commons According to a blog on esurance.com, more deer-related collisions occur in November than any other month. In general, deer are most active between dusk and 11 p.m., and they're especially frisky at this time of year. It's prime breeding season — you may have heard it referred to as "in rut" — and they run about more wildly than usual. So the chances of a collision increase. See Also: Where In Michigan You're Most Likely to Hit a Deer, How to It So slow down, know that if you see one deer more are likely to follow, pay attention to deer crossing signs and use your high beams — unless you're meeting an oncoming car, of course — to increase your chances of spotting them. Brake if you can, but don't swerve, because that could result in a more serious collision.

103 Million Asleep at the Wheel Photo by Jithesh via Flickr Commons Longer nights also induce drowsy driving. Of course, most of us don't go to sleep the moment it gets dark or wake up the moment the sun peaks over the horizon in the morning, but our internal clocks hardwire our bodies for that kind of sleep cycle. National Highway Traffic Safety Administration research shows drowsy-driving crashes most frequently occur between midnight and 6 a.m., or in the late-afternoon — both times when there are dips in your circadian rhythm — that's your internal human body clock. About 100,000 police-reported crashes a year are a result of driver fatigue, according to the NHTSA research.

And if that's not wake-up call enough, consider this: A staggering 103 million people admitted they fell asleep at the wheel when surveyed in a poll for the National Sleep Foundation, which observes Drowsy Driving Prevention Week during the week following the end of Daylight Saving Time, this year from Nov. 6-13.

Of those surveyed who said they had fallen asleep while driving, 13 percent said it happens regularly about once a month, and 4 percent said they caused a crash when they fell asleep. The poll also showed that 60 percent of adults say they have driven when they were sleepy.

Some other findings: Adults 18-29 are more likely drive when they're drowsy compared to other groups (71 percent, vs. 52 percent for drivers 30-64 and 9 percent for drivers 65 and older)

Men are more likely than women to drive while drowsy, 56 percent to 45 percent, and are almost twice as likely as women to fall asleep while driving, 22 percent versus 12 percent.

Parents and other adults with children in their households are more likely to drive drowsy than those without children, 59 percent to 45 percent.

Night shift workers are more likely than their colleagues who work day shifts to be drowsy when they drive to work, 36 percent versus 25 percent. Why Most Accidents Occur at Night Photo by Kristin Wall via Flickr Commons The risk of a fatal traffic accident is three times greater at night than during daylight hours, according to the National Safety Council. More animals, sleepy drivers and drunken drivers all play a role, but decreased visibility is the main culprit in increased night-time fatalities, the National Safety Council says.