I’ve always heard that each hour of sleep before midnight is worth two hours of sleep after midnight, and, by the way I feel, it’s probably true. The earlier you go to bed, the more refreshed you feel in the morning, and better able to face exercise.
I’ve always done better with losing weight when I get enough sleep so that I have more strength to resist temptation and make good choices.
Sometimes I think that to look and feel healthy, you have to have no life...i.e...go to bed super-early, sleep forever, and never eat good food in decent quantities!