90night: Calculator + alarm clock with synchronization by sleep phase

Some people believe that sleep - a uniform, a constant process. Observation and analysis of human sleep have shown that in fact we sleep intervals. Simply put, in the process of sleep cycles are repeated in our brain. On average, this cycle takes 90 minutes, and synchronization with the completion of a cycle of awakening allows a person to feel more sleep. Based on this method, each of us can find himself the time he needs to escape to sleep, and then divide sleep at 90-minute intervals and choose the most appropriate moment for awakening. However, if we consider lazy, then there is an option easier.

90night: Sleepy Time Calculator - a free app available to users of Android. In fact, it's a simple calculator that allows you to calculate the optimal time to wake-up and bedtime.

The user only has to specify the time when he used to sleep, and then calculator, based on 90-minute cycles, offer several options for the time of awakening.

The application also works in reverse. We specify the exact time when you need to get up, and then the calculator will offer several options for bedtime. Following them, the person is likely to provide a much better and more healthy sleep and good health the next day.

Each of us need different time trying to sleep. The calculator takes into account this fact and makes it possible to set the amendment on time, based on the individual durations of total immersion into the world of dreams.

The paid version of the app removes the screen hateful ads and the developer promises to add more in the full version of the calculator new features in the near future.

However, the free app is quite comfortable to use and does its job well.