Separately from that, there's a question of "which strategy is most likely to yield a good outcome." EG - you are welcome to get 100% of your calories from junk food, which is separate from our ability to discuss that you'll probably have a better life doing something different.

On this sleep thing - one can do whatever the hell they want, and of course they may have limits in place that are unique to them. Which doesn't preclude us talking about what would be best and then whether we want to and can get there.