Gwern comes close to suggesting filtering blue light, but I will repeat a previous post. I've tried melatonin, but it is no substitute for for filtering blue light in my experience, and it tends to induce horrific, apocalyptic nightmares (granted, a night dreaming of EAS Emergency Action Notifications is better than no sleep at all). I used to be an owl for years--decades. A regular 9-5 schedule seemed out of reach.…
What clued me in was when I went camping for a weekend after not camping for almost a decade. I found myself falling asleep and waking early, feeling better, even after a single night, and it got even better the second. Real darkness after sunset, and tons of bright sunlight in the morning.
Wearing the goggles IS a pain though. Worth it but a pain. F.lux didn't do nearly enough in my experience though it does seem to have an effect.
I also find that sunrise simulator clock is okay for waking up but not strong enough to replace bright light exposure in the morning. I would recommend eating breakfast outside in the sun for awhile, and if you find that helps, get some lights with some heavy duty lux for the winter mornings inside.