We do not always remember our dreams because upon waking, the brain quickly shifts from a sleep state (where dreams are produced) to a waking state where memory functions differently. Moreover, if one does not quickly pay attention to the dream upon waking, it quickly disappears from memory.
During REM sleep, your brain is hyperactive, almost as much as when you are awake. Certain brain regions, like the amygdala (involved in emotions) or the visual cortex, are running at full capacity — hence these particularly intense and visual dreams you have. However, your dorsolateral prefrontal cortex, a key area for logic, critical thinking, and especially long-term memory, is rather at rest. The result: even though you dream a lot, your brain does not clearly record these experiences into memory. It's like trying to film an exciting movie with a poorly tuned camera: lots of images, almost none that stick. That’s why most of your dreams evaporate upon waking, leaving no clear traces in your conscious memory.
During REM sleep, the balance of chemicals in our brain changes, and certain neurotransmitters play an important role in forgetting dreams. For example, acetylcholine, which increases during this sleep phase, promotes brain activity and vivid dream imagery but does not really contribute to memory formation. Conversely, the decrease in levels of neurotransmitters like noradrenaline and serotonin during REM sleep often prevents dream memories from being firmly stored in our memory. In short, the brain is active, images are flashing by, but the chemistry necessary for proper memory consolidation is not really present, so upon waking, the memories quickly fade.
The exact moment when we wake up greatly influences the ability to remember dreams. When we are abruptly awakened from a REM sleep phase (the dream-rich phase), it is common to recall dreams clearly, even in detail. Conversely, waking up outside of these moments makes it very difficult to retrieve dreams: it then feels as if they have flown away. The closer the awakening is to the dream, the easier it is to remember. The attention paid immediately after waking also matters a lot: if we take a few seconds or minutes to think back to the dream as soon as we open our eyes (or even better, if we write it down immediately), we greatly increase the chances of retaining it in memory. But as soon as we dive back into our daily activities or allow ourselves to be distracted, the memories disappear very quickly, especially in the first few minutes after waking.
Some people easily remember their dreams, while others hardly ever do. This difference notably depends on our sleep habits, lifestyle, and even our temperament. Those who have light, fragmented sleep or are punctuated by micro-awakenings often tend to remember their dreams better, because periods of wakefulness facilitate memory encoding. Conversely, if you sleep deeply and without interruption, you are less likely to remember your dreams. The way you wake up also plays a big role: a gradual and natural awakening or taking a few minutes in bed to reflect on your dreams significantly improves your dream recall compared to a sudden awakening with a loud alarm or intense ringtone. Finally, certain personal traits, such as high creativity, excellent imagination, or a naturally inward-focused attention, also promote better dream memories.
On average, a person has about 4 to 5 different dreams each night during REM sleep, although they usually do not remember any of them upon waking.
Individuals who regularly remember their dreams often wake up briefly during the night, which facilitates the encoding of these dreams into long-term memory.
Some medications, such as antidepressants, can significantly influence the quality of dreams and their recall by altering the normal functioning of the neurotransmitters involved in sleep.
REM sleep in infants accounts for up to 50% of their total sleep, compared to about 20 to 25% in adults, which explains why babies seem to move more while they sleep.
The ability to remember a dream strongly depends on the moment one wakes up during the sleep cycle. Dreams experienced during REM sleep, close to waking, are generally more easily remembered because the brain is in a state conducive to transferring memories to episodic memory. Additionally, emotionally intense or stressful dreams further activate the brain centers responsible for memory, thereby facilitating their recall.
Yes, there are several techniques to facilitate the recall of dreams. Keeping a dream journal near your bed and writing down your dreams as soon as you wake up, waking up gradually without rushing, regularly focusing on the intention to remember your dreams before sleeping, and adopting a regular sleep schedule are all recognized methods for improving dream recall.
After waking up, the brain undergoes numerous neurochemical changes: the state of wakefulness particularly involves a rapid decrease in levels of acetylcholine and certain neurotransmitters specific to REM sleep. Dreams, which are not optimally stored in episodic memory during sleep, can thus dissipate quickly. Furthermore, any distraction after waking, even minor, further disrupts the encoding of dreams into long-term memory.
Research shows that all individuals, except for those with specific neurological disorders, dream during their REM sleep. However, some people rarely or almost never remember their dreams, which can create the impression that they do not dream at all. This individual difference is primarily due to the unique neural functioning and sleep habits of each person.
Although the scientific community continues to debate the exact functions of dreaming, several plausible hypotheses exist: processing and consolidating memories, managing emotions, problem-solving, and stabilizing recent learning. REM sleep, the primary stage of dreaming, appears to play a particularly important role in the integration of new learning and the maturation of the nervous system.
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