This makes a lot of sense for deeper sleep where dreams are fragments of thoughts within a barely coherent mind but little sense in REM sleep where people have

This makes a lot of sense for deeper sleep where dreams are fragments of thoughts within a barely coherent mind but little sense in REM sleep where people have shown to be aware by doing preestablished eyemovements. There is a lot of indication that people are aware during dreams that occur in REM sleep (eye movement is unrestricted by the brain stem blocking signals so eyes move as if the person is doing things). Point being that if a person is aware and can do tasks and communicate with regular timing then the dream cannot take place at the moment of waking up.