The easiest way is to feel falling asleep and get a lucid dream - in a situation when for some reason woke up early in the morning, did something (opened / closed the window, went to the toilet, drank water), then lay down and want to sleep some more. Especially if you lie on your back. As a rule, falling asleep is as follows: there is noise in the ears, thoughts form visual images, some action begins from them, but you still control it, while physically feeling that your body is motionless in bed. You seem to be wearing virtual glasses. The action can become "sound", but you feel that the "sound" is, as it were, mental, not from the ears. If you start falling into sleep deeper, "sleep paralysis" arises: you no longer feel the real body in bed, but when you try to do something, say or scream (if the action has become scary), you try to do it with the real body, but it is passed out: 0 As a rule, this feeling is very uncomfortable, you try to get rid of paralysis and wake up. Personally, instead of screaming, I get a loud "snore" :)) But waking up from nightmares, as shown in the movies - when you suddenly sit in bed sweaty with bulging eyes, breathing heavily - in life does not happen. You will be sleepy anyway.
In fact, you can feel this moment, for example, when you are awakened in a half-asleep state (or when you just fell asleep), you remember how you fell asleep and understand that this is not an instantaneous process, but a sequential and gradual one. That is, there is no such thing as such.
I once managed to record the transition from a cheerful state to sleep. This moment is characterized by a stream of thoughts. At first, it can be controlled, then thoughts "go by themselves", capturing short memories, reflections (sometimes very important and interesting, therefore Salvador Dali slept with a spoon in his hand, so that by its fall it would help him to stop falling into sleep and keep important ideas). Thoughts are taken from our subconscious, which "records" everything that we saw, heard and felt. But it is sometimes difficult for us to remember something on our own, using the connections in our brain. When falling asleep, consciousness gradually stops its work on controlling connections. Therefore, they seem to "wander" through our subconscious and look for interesting moments.
In my case, I can add that at that moment, I felt completely immersed in the stream of thoughts, while the body remained motionless. Then the stream of thoughts stopped at a picture. She has already become the beginning of the lucid dream events.
Strange, but I remember this moment and the whole process of falling asleep too. I even developed my own ritual of falling asleep - first I lie on my back with my left hand raised, lying on my forehead. After a shiver runs through my body, as if the muscles had relaxed, already half asleep I turn onto my right side and finally fall asleep. Often, at the very moment of falling asleep, someone or something wakes me up and the ritual is repeated.
During sleep, the long-term memory block is disabled. Therefore, this moment is not fixed by the brain.
This is also why immediately after waking up, the dream can be recalled (it is stored in the RAM), but after a while it "decays", since the long-term memory block is not "loaded" right away.
For the same reason, people often forget their quite meaningful actions at night if they are suddenly awakened.
Feature of the sleep process. In addition to the process of falling asleep, memory also does not record short-term awakenings until full wakefulness. According to the latest research by somnologists, a normal person fully awakens for 2-3 minutes about 6-8 times a night. A person who does not suffer from sleep disorders does not remember these awakenings.
Do you remember when you sleep? Or when you pass out? Or when you fall into a narcotic sleep under general anesthesia? What is it all in common? The brain shuts down and receives nothing from the senses. So I'm wondering if black swifts remember this moment, because they sleep in flight