Sleeping with the lights on is actually better.

I frequently nap at midday and because i don't have blinds its quite bright in the room. I always sleep like a baby when i nap so i as an experiment i tried sleeping with the lights on at night and wow i slept better than i have in years. Normally I'm not able to fall asleep for at least 30 mins but with a lamp on right next to me i fall asleep instantly. Its a better way of life.