"ब्राह्मे मुहूर्ते उत्तिष्ठेज्जीर्णाजीर्ण निरूपयन् | रक्षार्थमायुषः स्वस्थो जातवेगः समुत्सृजेत् ||" (अष्टांग संग्रह)
It is the pre-dawn period when the Sattva (pure, positive energy) is high in nature. Vata governs the hours between 2 am and 6 am. This aids in Naturally and Easily Eliminating the Wastes out of the body. Due to the increasingly stressful lifestyle, it is hard to wake up during the early morning hours on a regular basis. It is recommended to be awake on ब्रह्म मुहूर्त at least during the three days of Diwali. According to Astang Sangraham, before waking up in the morning, one should assure proper digestion of food taken during last night. According to Atharvaved, a person who gets up in early morning will be free from diseases.
According to Bhagavadgeeta, a person whose Aahar Vihaar is correct, whose activities and life style is perfect and who sleeps and gets up perfectly will be free from all miseries. According to Charak Samhita, the word ब्रह्म मुहूर्त was not mentioned. But while explaining the Adhyayan vidhi, it has been explained that it is important for a scholar to get up early in the morning.
Charak says that one should get up during Upavyusha i.e, when still there is a part of raatri left which is nothing but Brahm Muhurt. Research benefits of waking up in Brahma Muhurt: According to the International Journal of Yoga and Allied Sciences, during the pre-dawn period, there is availability of Nascent Oxygen in the atmosphere. This Nascent Oxygen easily mixes with Hemoglobin forming oxyhemoglobin, which has the following benefits: