Miya Pearson
Sleep is crucial for learning and memory formation. While it is not possible to learn new skills from scratch during sleep, research shows that the brain is far from idle and some forms of learning can occur. This includes a basic form of learning called conditioning, where new memories are formed. For example, people can learn to associate sounds with odors while asleep. Sleep also helps to strengthen and consolidate memories formed while awake, making them easier to retrieve and apply. This process, called memory consolidation, occurs during non-rapid eye movement (non-REM) sleep, or dreamless sleep, and is aided by sleep spindles, or spikes in brain activity.
| Characteristics | Values |
|---|---|
| Possibility of learning while sleeping | Yes, but not in the way previously imagined |
| Types of learning possible while sleeping | Conditioning, memory consolidation, targeted memory reactivation |
| Types of learning not possible while sleeping | Absorbing complex information, learning a new skill from scratch, learning a new language |
| Benefits of learning while sleeping | Changing habits, altering disturbing memories, treating phobias and PTSD |
| Techniques for learning while sleeping | Auditory cues, smell cues, EEG kits, sleep-cueing, REM sleep |
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What You'll Learn
Memory consolidation
Studies have shown that non-rapid eye movement (non-REM) sleep is crucial for memory consolidation. During the second stage of non-REM sleep, sleep spindles, or sudden spikes in oscillatory brain activity, are key for memory consolidation. Scientists have also been able to specifically target certain memories and strengthen them by using auditory cues.
Research has also shown that REM sleep is important for the consolidation of the emotional components of memories. Studies in humans have shown that emotional arousal during encoding is beneficial to recall only if REM sleep occurs after learning. The precise mechanisms by which REM sleep promotes the consolidation of emotional memories are still unknown, although some studies suggest that LTP processes are activated during REM sleep.
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Targeted memory reactivation
TMR is a well-established technique to selectively stimulate specific memories to be reactivated during sleep using sensory cues linked to prior learning. In TMR studies, specific cues like odors or sounds are presented during learning to become associated with the learning material. The same cues, or a subset of these cues, are then re-presented during subsequent sleep. Thereby, TMR can be used to directly manipulate memory reactivation and consolidation during sleep.
TMR has been investigated across various paradigms for declarative memory, demonstrating its versatile application and potential as a memory-enhancing technique. Numerous studies have explored tasks involving word pairs, spatial navigation, associative learning, and other types of memory tasks. In many TMR studies, this learning material is paired with distinct sounds or tones (e.g., the picture of a cat with the sound "meow"), with the sounds or tones then being presented again during subsequent sleep. In this way, single learning items can be paired with specific sounds, allowing for a more targeted reactivation of single items during sleep. Other studies include a learning session in the presence of an odor (e.g., the scent of roses).
TMR in REM sleep has been shown to elicit detectable reactivation. The first evidence for non-REM reactivation came from rodent studies, and such reactivation has subsequently been identified in humans using EEG classifiers, fMRI, and intracranial recordings. Only a few rodent studies have shown evidence for reactivation in REM sleep, but support for such reactivation in humans comes from work by Schönauer et al., 2017, who used EEG classifiers to distinguish between REM sleep on nights after training on two very different tasks.
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Learning basic forms of conditioning
Sleep is crucial for learning and memory formation. While it is not possible to learn a new skill or language during sleep, research shows that the brain is far from idle and some forms of learning can occur.
One basic form of learning that can happen during sleep is conditioning. Conditioning is a powerful explanation for how we learn many different things. There are two types of conditioning: classical (Pavlovian) and instrumental (operant).
Classical conditioning involves forming an association between two stimuli, resulting in a learned response. It focuses on involuntary behaviours and uses associations with neutral stimuli to evoke a specific involuntary response. An example of this is salivating in response to the smell of food. In this case, the smell of food is the unconditioned stimulus (UCS) that results in an unconditioned response (UCR) of salivation. A neutral stimulus, such as a bell, can be paired with the UCS so that it too evokes a response. This is the basis of classical conditioning.
Operant conditioning, on the other hand, occurs when a behaviour is associated with the occurrence of a significant event. This type of conditioning provides a method for studying how consequences influence voluntary behaviour. In the famous example of a rat in a "Skinner box", the rat learns to press a lever in its cage to receive food. The rat has no natural association between pressing a lever and getting food, so it must learn this connection. Eventually, the rat will voluntarily press the lever to receive its reward.
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Changing habits or altering memories
Sleep is crucial for learning and memory formation. It helps to strengthen and stabilise memories, linking new memories to earlier ones. This process of memory consolidation appears to happen during sleep, specifically during the non-REM stages of sleep.
Memory consolidation is a key factor in understanding new information. Sleep deprivation can negatively impact memory consolidation, making it difficult to learn new things and to recall existing memories. It can also lead to neurological damage to the hippocampus, a region of the brain critical for learning and memory formation.
However, research has shown that learning can occur during sleep, and this knowledge could be applied to changing habits or altering memories. For example, a 2014 study found that smokers used fewer cigarettes after being exposed to the smell of cigarettes paired with rotten eggs or spoiled fish while they slept. Another study found that participants were able to better recall pictures when the associated words were repeated during their nap.
While the memories formed during sleep are implicit or unconscious, they can still affect people's behaviour. This implicit nature of sleep learning makes it useful for changing habits or forming new ones. For instance, conditioning techniques that don't work well when done during wakefulness can be effective during sleep, as the sleeping brain is more susceptible to manipulation.
Technological interventions, such as apps that track sleep patterns and provide guided meditations, can also help improve sleep and, in turn, memory. However, it's important to establish and maintain healthy sleep behaviours to improve sleep quality and memory retention.
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Using sensory cues
While the idea of learning complex new information during sleep is far-fetched, research shows that the brain is active during sleep and that some forms of learning can occur. Sleep is known to be crucial for memory consolidation, and scientists have discovered ways to use sensory cues such as sounds and smells to strengthen memories during sleep.
In a 2012 study, researchers found that people can form new memories during sleep by associating sounds with odors. In the study, a spoiled-fish smell was unleashed while a tone was played for sleeping participants. Upon waking, the participants anticipated a bad smell when they heard the tone. This demonstrated that humans can form new memories during sleep, and that these implicit memories can affect behavior.
In another study, participants were taught the locations of objects on a grid while being exposed to the scent of roses. During their deepest stage of sleep, they were again exposed to the rose scent. When awake, the participants better remembered the locations of the objects. This method only worked if the participants were exposed to the scent during learning and slow-wave sleep.
In a similar study, participants played a game where they learned the locations of objects, and each object was associated with a unique sound. During slow-wave sleep, a single sound was played, and the participants were able to remember the location of the corresponding object better than the other objects. This ability to select specific memories to reactivate is called targeted memory reactivation (TMR).
Sensory sleep cues can also be used to help babies sleep better. By repeatedly exposing babies to certain sensory cues when they are sleeping, they will begin to associate those cues with sleep. These cues can then be used to help babies settle more easily and feel safe when falling asleep.
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Frequently asked questions
No, you cannot learn entirely new things while you sleep. However, you can strengthen existing memories and integrate them into a network of long-term memory.
Sleep is crucial for memory consolidation, a key factor in understanding new information. During sleep, the neural connections that help develop lasting memories become stronger.
Sleep learning, or hypnopedia, is the concept that you can learn new things while you sleep. While this is not possible, research shows that the sleeping brain is far from idle and that some forms of learning can happen.
You can strengthen memories while you sleep using sound and smell cues.
