Timing is everything! Brahma Muhurta is the time approximately 1.5 hours before sunrise - so it would vary based on your geographical location and sunrise time (usually between 3:30-5:30)

In the Ashtanga Hridayam Sutrasthana 2:1 is is said that waking up in the Brahma Muhurta can protect our health and longevity and promotes success in all areas of life. 

Brahma Murhurta literally means the ‘creators time’ - So it’s a perfect and auspicious time to rise and engage in our inner work, self care rituals, spiritual practices, creative work, perceive and receive knowledge.