Using the ornthinine suggested in the new version of Hulda's flush will help you go to sleep. If you buy a bottle, you will see that the directions say to take one BUT Hulda's instructions say to take 8. I normally only take 4 and I'm fine - no side effects that I can tell. I don't trouble sleeping though, so you may want to go ahead with 8.
Right side or back...I really don't think it matters. Mostly personal preferance and which one you think feels better for you.