9 Surprising Reasons You Can't Fall Asleep

Every once in a while you have a bad night's sleep and you know exactly why: You found yourself at the coffee maker at 4 p.m. or there were sirens blaring outside your window all night or maybe your allergies are killing you. But more often than not the reasons behind your less-than-satisfactory slumber remain a mystery and you slog through the day with the unpleasant memory of your alarm clock's siren close at hand.

We're shining a light on some of the most surprising reasons you can't sleep below. Some of them you can't control, but some of them require only the tiniest of tweaks to help you hit the hay in no time.

You Slept In Saturday And Sunday
We've all been tempted to spend some extra time in bed on a Saturday or Sunday morning (or both, whoops!), but experts say that sleeping late on the weekend (and staying up late, too) can be a bad idea -- for reasons other than productivity. Adjusting your wakeup time can throw off your biological rhythms so drastically that your body feels like it traveled across time zones, and when it comes time to drift off Sunday night, this so-called social jet lag likely won't let you fall asleep without a fight.

It's A Full Moon
No, you're not turning into a werewolf. But the lunar cycle does seem to have some effect on our sleep, at least according to a small study. Researchers found that during the nights around a full moon, people get less deep sleep, less total sleep and took about five extra minutes to fall asleep.

Click here to read about the other things that may be affecting your sleep.