I'm definitely a night owl who sleeps around that time (usually around 1-2am but sometimes even later) and IF with an eight hour eating window between 12pm-8pm

I'm definitely a night owl who sleeps around that time (usually around 1-2am but sometimes even later) and IF with an eight hour eating window between 12pm-8pm is really easy to do. I usually start eating around 12:30pm and finish eating around 7pm but to me the occasional dinner that goes until 9pm is not a big deal. You get used to it after a few weeks. In fact it feels really weird to eat before sleep once you get used to IF.