Since dreaming is just a creation of mind this can never be demonstrated logically that one is not dreaming. Similarly, the limitation of one’s waking state is known /realised only if one has ‘experienced’ the state of ‘Turiya’. Of course, even this waking state is not ultimate and has been the subject of Eastern philosophies for thousands of years.
Actually we talk about dream only in waking state. Since no one experiences all three conditions3 STATES OF EXPERIENCE (WAKING, DREAM, DEEP SLEEP) simultaneously, [whatwhat is common in ‘Waking’ State of Experience (Jagrat Avastha), ‘Dream’ State of Experience (Svapna Avastha), ‘Deep Sleep’ State of Experience (Sushupti Avastha), is the truth][2]truth. Therefore, even if one asserts that he can express this idea in this way, it must ultimately be absurd.