Sleep Time promises the user not only an alarm clock that will wake them up, but also a sleep analyser that will judge when it’s best to set the alarm off. It’s an interesting feature, and one that definitely warrants further investigation.
Sleep Time developer, Azumio, claims that a regular alarm clock often wakes the user when they are in a deep sleep, therefore they will wake up feeling tired (which sounds rather familiar, as it happens to me every day).