 तौ तु तद्वचनं श्रुत्वा राजपुत्रौ यशस्विनौ।अनिद्रौ षडहोरात्रं तपोवनमरक्षताम्।। 
 At these words of the sages the illustrious princes got ready to protect the tapovana for six days and six nights without sleep.  