Sleep as Android alternatives

Sleep as Android
Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking-up from the deep sleep is very unpleasant, it makes you tired and it may negatively affect your productivity during the whole day. In contrast Sleep as Android tracks your sleep during night and given a time range, it chooses the optimal moment to wake you up (ideally in light sleep). Waking up in light sleep is natural, gentle and it may only be compared to the experience of waking up without any alarm clock.
Sleep as Android alternatives are:
SleepTracker, Jawbone UP, Sleep Cycle
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