1 am To 3 am
This is the time for detoxification and renewal of the body, the liver releases the toxins and the blood is fresh and clean. Waking up between 1 am and 3 am might be a result of negative formations like frustration and anger, or some problems with the function of the liver.
3 am To 5 am
The lungs are undergoing repair and flood the body with oxygen at this time and the body should be warm enough to speed up the function of the body.
From a spiritual side of view, this might be a symptom of grief and sadness, so you might benefit from some breathing techniques.
Also, this might be a sign of ascension or a process of an increasing of the vibrational levels, which might lead to sensitivity to unusual sounds, appetite changes, feeling cold, or lucid dreaming.
5 am To 7 am
The large intestine is extremely active at this time, and it breaks down toxins and removes them from the body. The reasons for waking up at this time include poor nutrition or eating too late.