Here's something to keep you up at night; you could be sabotaging your sleep without even knowing it. It's bad enough that your kids can't tear themselves from their smartphone screen during daylight hours. But as all-too-many parents know all too well, teens are also taking phones with them to bed -- and frankly, mom and dad are doing the same. A newly-released online and telephone parent-teen study from Common Sense Media bears this out: Nearly 7 in 10 children, or a slightly lesser percentage than their parents, kept their mobile device either in bed or within easy reach. And 29% of the younger group actually sleeps with the device, compared to 12% of parents.