I've found sleepyti.me to work for me. After a while of paying attention to sleeping for a preset duration instead of waking up at a preset time it became kind

I've found sleepyti.me to work for me. After a while of paying attention to sleeping for a preset duration instead of waking up at a preset time it became kind of automatic, and nowadays I wake up before the alarm (often just a minute or a half before) but I still set it out of habit.