I used to have trouble getting up by 9am back when I lived in my parent's basement. When I moved out on my own, I started waking up at 7am. It was the sunlight

I used to have trouble getting up by 9am back when I lived in my parent's basement. When I moved out on my own, I started waking up at 7am. It was the sunlight which did it. It was bright shining through the shades and when I lived in the basement, I had no windows.