What's are good apps (iPhone) that track our sleeping cycle?

I want to find an app that helps me see when I'm in deep or light sleep, or even awake. I have downloaded many apps (free) but some are a little silly and ony work when I use the alarm. The alarm is good, but I'm on holiday and I want to see my sleeping pattern but I have to use an alarm. Does anyone know any good apps that show that but doesn't need an alarm? Even if I have to buy it. Please show the ranking of stars you give it and tell me why it's worth buying. Thank you in advance! Please answer As soon as possible.

An app called sleepcycle, costs 0.99$

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