The Sikh tradition is to rise three hours before sunrise, bathe, meditate until dawn, and at first light, begin morning prayers of Nitnem. As far as I know, the practice of rising before daybreak to worship is unique to Sikhism in that waking up during the first watch of day to contemplate naam is proscribed by Rehit Maryada code of conduct and outlined in the scripture of Guru Granth Sahib:
"Gur satigur kaa jo sikh akhaa-ae su bhalkae outth har naam dhiaavai ||
A seeker of the True Enlightener who calls them-self a Sikh of the Guru, shall rise in the early hours of morning and contemplate upon the Lord's Name".
Bathing at Dawn
Photo © [courtesy Gurumustuk Singh Khalsa]