This app is just what I was looking for. Im one to wonder all the time what time I need to be up the next day for work, an appointment, or whatever. Sure I can do the math but this app helps me breakdown how many hours of sleep I can get in benchmarks based on how long it takes me to get to sleep and when I need to be up in the morning. I love it! So simple and easy. So glad I found this app. I hope more people use this app and supply more reviews. People need this app.