Lamarca thanks for the link to that article. I've always had "difficulty with sleep" and this might give a clue to resolving it. I know so many married couples who are split into morning person and night person. Does it happen more once they've got kids? Why are musician's night owls? With the repellent on you can play an instrument you know or sing in the dark on the porch or by the fire till morning and not need any light to see by. Night is a time when we expect less visual distraction and therfore may be more responsive to sound.