Lots of good advice in the other replies (no screens right before bedtime, create routines, etc) but one thing that I didn't see mentioned yet is that you may have to become more careful about your caffeine intake throughout the day - I have to wake up early due to kids and it's forced me to set a rule that Sunday-Thursday I don't have any coffee or tea after ~2pm (on weekends there's a little leeway and it's more like a 4pm cutoff). Your mileage may vary, but caffeine can interfere with your sleep patterns much more than you may realize -- certainly more than I realized a few years ago.