Love this!

I love this app! I have difficulty sleeping and rarely feel well-rested in the morning. Using this app has shown me just how often I wake up in the night, and what times seem to be common for me to come out of deep sleep. I can now use this data to help me determine my optimum bed-time. Also, the wake up feature that syncs with sleep cycles is amazing. I wake up in a much better mood than previously, and I dont sleep through the alarms. Prior to using this app, it took 12 alarms to wake me up, and even then I would oversleep! Now I am down to using just this app.

Toni_Snark about Sleep Cycle - Tracker & Sounds, v5.2.1