Muhurta

 Brahma muhurta (time of Brahma) is a period (muhurta) one and a half hours before sunrise or more precisely is 1Hr 36 Mins. i.e. 96 Minutes = 2 Muhūrta or 4 Ghaṭīkā,and lasting for 48 minutes. Literally meaning "God's Hour", it is traditionally, the last phase or muhurta of the night and is recommended as an auspicious time in all practices of yoga and most appropriate for meditation, worship or any other religious practice. 
https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=643&q=Brahmamuhurtha 
https://www.youtube.com/results?search_query=Brahma+Muhurta