I would like to know whether meditation can be a substitute to sleeping? I mean, can we meditate at night without sleeping?
The Great Adi Sankaracharya said:
The witness of the three states of consciousness [waking, dream and deep sleep] and of the nature of Existence-Consciousness-Bliss is the Self
Do we really need sleep? Because in meditation too we are thoughtless and not doing any physical work.
I would like to know if there are any scriptural references to this.