I rarely need one anymore. I have a set time I go to bed & get up. It's been working for me for many years now. Only time I use it is to wake up with my husband for him to go to work. I'm not up at 4:30 am! lol I really appreciate the weekends when I don't have to get up early because then my sleep is uninterrupted & I feel more refreshed when I do wake up for the day.