Have you ever noticed we dont remember anything in our dreams?
There are two possible phases of sleep that one usually wakes up during: Phase two of NREM (non-REM) REM When you wake up and you don't remember anything, just remember going to sleep and a dark void in between, you have woken up during NREM sleep! If you wake up and remember what you were seeing, it was REM you woke up from. In some sleep disorders, dreaming continues well after waking up. This is called hypnopompic hallucinations, which may seem real and can be frightening.