If the product works really, really well and users end up waking up at the optimal time the vast majority of the time, that may (or may not) be different from t

If the product works really, really well and users end up waking up at the optimal time the vast majority of the time, that may (or may not) be different from the conditions in which we evolved and the various adaptations we've made since then that are better studied. It could have some sort of adverse effect. It's very unlikely.