HappyWakeUp works as a smart alarm clock. HappyWakeUp is based on medical research of the human sleep and its structure. It smartly monitors your sleep using the microphone of the mobile phone. It gives you an alarm signal in the morning - but only if you are awake or almost awake just before the final wakeup time.
At this kind of moment your body and brain is ready to wake up naturally and without any extra stress. See details of the medical research data on How it works -section! With HappyWakeUp all mornings are created equal.