Sakhi from Subedar Baghel Singh “Jivan Anubhav” his autobiography.
He says one day after his simran he sat down to rest. His Astral body (sookham sahreer) separated from his body went through the roof at a very high speed. His Astal body left the earth behind and ended up in a place where there were various Sant mandalis. He was surprised to see himself in two separate place but mere thought of his body brought him back inside his body.
Similar stories can also be found in pachmi parkash jeeven sant Karam Singh Hotimardan and Se Kinehya Jeeveni Sant Harnam Singh Rampurkhera.
It's a very potent time for spiritual reward because mind is fresh and full of concentration and stressless and the world surroundings are quiet
Best method is begin some simran then recite mool MANTRA then perhaps some recital of memorized bani THEN do Nitnem and then go to Gurdwara thus avoiding sleep is essential