Is it so easy to fall asleep in an upright pose in a matter of only a few minutes? We must understand that in deep meditation our condition resembles that of a sleeping person, and it is known as a Samadhi-like state. However, we can easily understand whether we have been sleeping or meditating by observing how we feel afterward. If it were sleep we would feel groggy, whereas if it were deep meditation we would feel refreshed.
As we progress, we gain awareness within those deeper states of meditation. It is as if we are simultaneously awake and in a state of deep sleep. As this state develops further, we find that in wakeful daily life, our thoughts and actions proceed so naturally, lightly, and even automatically, that we do not feel that we are actively bringing them about as their doer.