2:00 AM ![deepest sleep stage - Features of Your Biological Clock [Plethrons.Com]](http://plethrons.com/wp-content/uploads/2013/10/deepest-sleep-stage-Features-of-Your-Biological-Clock-Plethrons.Com_.jpg)
The body reaches its deepest sleep stage. It’s also when the body repairs itself and builds up energy for the day ahead.
4:30 AM ![lowest temperature - Features of Your Biological Clock [Plethrons.Com]](http://plethrons.com/wp-content/uploads/2013/10/lowest-temperature-Features-of-Your-Biological-Clock-Plethrons.Com_.jpg)
The body reaches it’s lowest temperature.
7:30 AM ![Melatonin secretion stops - Features of Your Biological Clock [Plethrons.Com]](http://plethrons.com/wp-content/uploads/2013/10/Melatonin-secretion-stops-Features-of-Your-Biological-Clock-Plethrons.Com_.jpg)
The melatonin secretion stops as the body begins to wake up.

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