The following also refers to Kundalini Jagran as explained by BHagat Namdeo ji. Its entry in Granth sahib ji shows that This method of awakening of Kundalini and opening of the 10th gate was fairly practised during those times as well.

ieVw ipMgulw Aauru suKmnw paunY bMiD rhwaugo ] (973-2, rwmklI, Bgq nwmdyv jI)
Then, I shall no longer control the breath through the energy channels of the Ida, Pingala and Shushmanaa.
cMdu sUrju duie sm kir rwKau bRhm joiq imil jwaugo ]2] (973-3, rwmklI, Bgq nwmdyv jI)
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/gurmat-vichaar/18394-naam-japna.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=18394
I look upon both the moon and the sun as the same, and I shall merge in the Light of God. ||2||