Work on communicative lucid dreaming might also open up the possibility to test further phenomenally distinguishing features between the two states via individuals communicating statements about these features.
There are also examples of consciousness at the periphery of sleep that makes it difficult to delineate the boundaries of what does and does not count as a dream Mavromatis,
Dennett provides a number of other anecdotal examples that imply that the narrative to dreams is triggered retrospectively, after waking.
This third argument supports the first argument that dreams are unverifiable and anticipates a counter-claim that individuals might be able to report a dream as it occurs, thereby verifying it as a conscious experience.
The second way:
How can I know that I am not now dreaming?
The written report confirms the eye movements and the participant is not shown any of the physiological data until his report is given.
Dreams compensate for imbalances in the conscious attitudes of the dreamer.
The question then arises as to why we should believe that somebody with even a good day-to-day memory is in any better position to remember earlier conscious experiences during sleep after waking.
Appropriate environmental or cognitive stimuli trigger patterns of behaviours or thought that are inherited, such as hunting, fighting and mothering.