Gurudev, you said that the knowledge of sleep brings freedom. What does this mean?
Knowledge of sleep and dreams can take you into a different state of samadhi. It is one of the techniques mentioned in the Yoga Sutras by Rishi Patanjali.
Maharishi Patanjali has said the sutra, 'Swapnanidrajnanalambanam va'
This is one of the samadhis that he mentions while describing the different types of samadhis.
If you are aware of how sleep is dawning on the mind, in between the sleep and waking state, there is a spark of total stillness. I am saying only spark of stillness because stillness is so dynamic, so alive. That is what he is talking about.
So if you notice, just before falling asleep, or as soon as you wake up, you are neither fully asleep nor fully awake, in that gap, there is certain peace, a certain quality of consciousness which is so beautiful, so soothing and so healing. That is what is mentioned there.