I don't like sleeping in dark rooms

I don’t like to sleep in near pitch black rooms. It just feels unnatural to me. It may be more the fact that it prevents the gradual transition to daylight unless you’re using an artificial light, so that bothers me more because you don’t know when morning is. But even when traveling I love to keep the curtains open through the night and sleep to whatever the natural light level is around me even if it’s in the middle of a city.