I have, and I also have done a lot of shift work too and easily switched regimes many times. The trick is very simple - if you want to wake up and have breakfa

I have, and I also have done a lot of shift work too and easily switched regimes many times. The trick is very simple - if you want to wake up and have breakfast in 6 am, your last meal must be 14 hours before that - which is 4 pm on the previous date. No snacks, no dinner not anything like this. You will be hungry but you will find yourself falling asleep at about 10 pm. If you don't stay in front of a screen you can go to sleep easily. You will then wake up at 6 am - fresh, but hungry. Its important to have a quick breakfast or you will fall asleep again. Try to keep this eating/sleeping schedule, you can relax it a bit (i.e. have dinner at 6) after the first week. People are of course different, so while 14 hours work for me, some people do it with 12 or 16 hours, but the idea is the same. This tip/lifehack also works for jetlag: https://hbr.org/2009/05/a-fast-solution-to-jet-lag https://hbr.org/2009/05/a-fast-solution-to-jet-lag