At times, dreams may occur during other stages of sleep. However, these dreams tend to be much less vivid or memorable. The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes. People are more likely to remember the dream if they are awakened during the REM phase.
The longest dreams—up to 45 minutes long—usually occur in the morning. There are certain things you can do before you go to bed to control your dreams.
Dreams can last for a few seconds or they can last for up to two hours. They feel longer because our brain works differently when we're sleeping than when we're awake!
According to Dr. Watson, even if you fall asleep as soon as you lay down, it'll still take you between 70 and 90 minutes to start dreaming. But, normal sleep latency—aka how long it takes you to fall asleep—is 30 minutes after turning out the lights.
A total non-REM–REM cycle is 90 minutes; this pattern repeats about five times over the course of a night. As the night progresses, however, non-REM stages shorten and the REM periods grow, giving us a 40-minute dreamscape just before waking.
REM sleep happens about an hour to an hour and a half after falling asleep. REM sleep is when you tend to have vivid dreams.
REM is where most dreams occur, and most people experience between 90 minutes to 2 hours of REM (dreaming) sleep each night, with a maximum of about 45 minutes in the longest phase of REM. Therefore a lucid dreamer could consider themselves very lucky to experience a lucid dream lasting 45 minutes!
Sometimes the dreams we have seem so real. Most of the emotions, sensations, and images we feel and visualize are those that we can say we have seen or experienced in real life. This is because the same parts of the brain that are active when we are awake are also active when we are in certain stages of our sleep.
“Since dreams are thought to primarily occur during REM sleep, the sleep stage when the MCH cells turn on, activation of these cells may prevent the content of a dream from being stored in the hippocampus – consequently, the dream is quickly forgotten.”
The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes. People are more likely to remember the dream if they are awakened during the REM phase.
It may seem that way, but it is impossible. It is believed that the human brain is incapable of “creating” a new face. Every person you dream of has been someone you have either known personally or merely came across looking through your friend's Facebook photos.
Since our dreams typically don't repeat themselves, all it takes is dreaming the same dream twice or more for it to be considered recurring, Barrett said. They're more common in childhood, Barrett said, but can last into adulthood.
Our brain is not fully developed when we are born—it continues to grow and change during this important period of our lives. And, as our brain develops, so does our memory.
The results indicate that although pain is rare in dreams, it is nevertheless compatible with the representational code of dreaming. Further, the association of pain with dream content may implicate brainstem and limbic centers in the regulation of painful stimuli during REM sleep.
Lucid dreaming is a fascinating phenomenon in which a person is aware that they are asleep and dreaming. Those who are more adept at lucid dreaming are able to control the action and content of their dreams to varying degrees.
Waking up Crying From a Dream
The sensations you feel while sleeping and the emotions you experience before bed may cause you to wake up crying. If you wake up crying from a bad dream, that is your body's response to the weight of the suppressed emotion.
Later studies showed that lucid dreaming often occurs during moments of particularly high arousal or change in brain wave activity in the outer layer of the brain. Recognition of dreaming may occur specifically in the dorsolateral prefrontal cortex, where working memory, planning, and abstract reasoning occur.
Prevalence and Induction Methods
Generally, lucid dreaming is quite rare. Only one half of the general population know the phenomenon from personal experience, approximately 20% have lucid dreams on a monthly basis, and only a minority of approximately 1% have lucid dreams several times a week.
The longest recorded period of REM is one of 3 hrs 8 mins by David Powell (USA) at the Puget Sound Sleep Disorder Center, Seattle, Washington, USA on 29 April 1994.
Healthy dreaming may be indicative of quality sleep that facilitates sharper thinking, better mood, and overall health. People who remember their dreams often show higher levels of creativity. View Source .
In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named. The entire sequence from drowsiness to deep stage IV sleep usually takes about an hour.
Don't Wake Them Up
However, it's important not to wake them up and allow them to work through the episode. They're more likely to forget the dream if they can sleep through it. Waking them up in the middle of a nightmare can be jarring, making it difficult for them to forget the imagery or get back to sleep.
It is generally accepted that no-one can recall their birth. Most people generally do not remember anything before the age of three, although some theorists (e.g. Usher and Neisser, 1993) argue that adults can remember important events - such as the birth of a sibling - when they occurred as early as the age of two.