Want a good night sleep and awake refreshed? Try this. Before you turn out the lights write out a list of situations in your life for which you are grateful and appreciative.
This writing exercise will put you in a positive and relaxed state of mind and allow your nervous system to relax. You are now in a much better state to fall asleep and stay asleep.
Focusing on problems when you climb into bed is not a good state of mind and tenses your nervous system. Remember, if you give your mind a problem, it will stay up to try and help you resolve it. That's what our mind does: it solves problems.