Bobby Darin might have been on to something when he sang about "tossing and turning all night."

If you are over 65, there's about a one-in-three chance you suffer from a condition called "periodic limb movements" during your sleep, according to the National Sleep Foundation.

While it's not considered serious in itself, the condition can lead to insomnia and a feeling of sleepiness during the day.

There are medications that can treat the syndrome, so you should check with your doctor. Otherwise, you might find yourself sleeping alone.