Fear of the dark

I have never been afraid of the dark and never of living alone but these few days I got really afraid and had to turn the lights on before sleeping infact I was awake for most part of the night.
The issue was that I give way to my fear , I should have turn off the lights and doesn't matter how much afraid I got I should've been brave.
I guess I'll be brave from tomorrow and sleep with the lights on for today