You Are My Night-time
I'm much more relaxed in the dark. Having the light on makes me end up looking and something or being distracted by a task left undone, until I'm driven insane and have to get up and finish it.
It's the best way for my eyes to rest.
I've felt more secure in the dark, too, since the monsters and boogey-men all lost their patience, crawled out of their dark corners and from under the bed, and went somewhere else.