It is very difficult for a WO-man who returns home after having traversed the entire city to remember in detail all of HER/his thoughts, ideas, incidents, things, etc. Upon trying to recall, SHE/he will discover huge gaps in HER/his memory, which correspond precisely to the most profound states of sleep. To be conscious of oneself is something very difficult; but, one can attain that state by learning to live alert and vigilant from moment to moment.
– Samael Aun Weor
Related: http://buddyhuggins.blogspot.com/p/awakening.html