My wakeup time is flexible so I have tried the whole spectrum, going to bed earlier (10pm) or later ~12am, ~2-3am. Waking up without alarm for all these sleept

My wakeup time is flexible so I have tried the whole spectrum, going to bed earlier (10pm) or later ~12am, ~2-3am. Waking up without alarm for all these sleeptimes feels roughly the same so I'm not sure if I'm a "lark" or "owl". My focus is definitely the best in the evening, just hate the slow fogginess in the morning and would like to switch to "lark" mode, unsuccessfully. Waking up with alarm makes me more sharp than without alarm but as the wakeup time is flexible it feels stupid to do so and I fallback to dizzy mornings and late-night work against ma inner will.