Did you install or already have black bedroom curtains and do they help you sleep?

I spent a night at my daughter’s house. I slept in the master bedroom on a Sleep Number bed. She has black blinds and black curtains and I’ve never slept that well since. Do you have black curtains to block out the light and do you sleep great because of it? Or did you put up black curtains just to sleep better and they were a resounding success?