Sleep Time Calculator is a free iPhone app developed by Recked Software LLC. This app helps you determine the best times to wake up in the morning based on the cycles of sleep you go through during the night.

During sleep, we go through five stages, and these stages repeat in cycles. The first cycle, which includes the first REM stage, typically lasts for 90 minutes. With 8 hours of sleep, you usually go through 4-5 cycles.

Waking up in the middle of a cycle can leave you feeling groggy and tired, while waking up at the end of a cycle can leave you feeling awake and alert. Sleep Time Calculator provides recommendations on when to wake up in the morning to decrease the likelihood of feeling groggy throughout the day.

This app is a useful tool for anyone who wants to optimize their sleep and wake up feeling refreshed. It takes into account the natural cycles of sleep and provides personalized recommendations for waking up at the right time. Sleep Time Calculator is a must-have app for those who want to start their day on the right foot.