That bedtime routine is such a hurdle and has definitely kept me up late on more than occasion. So, while I'm not as diligent about it as you, I do try to do it before I'm actually ready for bed. Another thing that helps me is that our living room lamp is on a timer. This means that:
1) turning it off is one less thing I need to do to make it to my bed (gosh, I sound like the epitome of lazy)
2) if it goes off and I'm still in the living room, it's a reminder that I should go to bed