Remember, meditation is not something that is done by the mind, it is the absence of the mind. When the mind stops meditation happens. It is not something out of the mind, it is something beyond the mind. And whenever you are alert, the mind is not. So we can conclude that your sleepiness is your mind, your unawareness is your mind, your somnambulism is your mind. You move as if drunk, not knowing who you are, not knowing where you are going, not knowing why you are going.