It is possible to fall asleep during a hypnosis session.
This state does not limit learning, but it is best to stay awake.
Hypnosis is a state of altered consciousness. You continue to perceive your external environment but you process perceived information at an unconscious level. You are both here and not here. This is called dissociation. In a state of hypnosis, you are semiconscious but not asleep.
To avoid falling asleep, we recommend listening to the lessons at times of the day when you are not feeling sleepy, like after a big meal or just before going to bed.