By now i'm sure you've grasped the importance of getting enough sleep, if you haven't then I give up.  Hopefully though you have and now you want to know how to get a sound night's sleep. The big question is though, what's causing our poor sleep habits? Because although short sleep duration is bad for us. Obviously we didn't all just decide to start getting up earlier and going to bed later everyday. The amount of sunlight we have is no different, so what gives? The answer is our moder...