turned off?? 

most of us have a laptop, smart phone and tablet.... and will constantly use any or all of these right up when we try and go to sleep

research shows that you need 'electronic shutdown' at least 2 hours before bedtime. if not, it will affect your sleep, in a bad way! the light emitted from these types of devices reduces the amount of the sleep inducing hormone (melatonin) you produce.... 

so avoid that Tweet from the bedroom, or the 'Goodnight World' status on Facebook and read a good book, or listen to some nice music