Smiling in your sleep usually signifies that you are experiencing a pleasant, happy, or humorous dream, often during the Rapid Eye Movement (REM) sleep stage. While it most commonly reflects positive emotions and, in babies, can be a reflex or muscle development, it can also act as a coping mechanism, turning stress or anxious thoughts into a more comfortable state.
Two scenic behaviours including smiles and laughs suggested that the happy facial expression was associated with a happy dreaming scenario. Smiling and laughing occasionally persist during adult sleep. There are several lines of evidence suggesting that these happy emotional expressions reflect a true inner mirth.
If you laugh in your sleep, evidently you're amused by something or someone you're dreaming about. This would be natural since we experience emotions when we are dreaming.
Likely a reflex and a part of normal development, this sleepy giggling is often a precursor to their first real smile (around 2 months) and their first real laugh (around 6 months). Babies may experience dream-like activity, and they may smile or laugh and make other movements during their active sleep stages.
Rapid Eye Movement (REM) or Active Sleep
The vast majority of newborns' smiles during sleep appear to occur when the eyes are moving rapidly, as they would during a dream. Studies suggest that adults smile in response to positive dream imagery.
The one most frequently associated with lying was a high intensity version of the so-called Duchenne smile involving both cheek/eye and mouth muscles. This is consistent with the “Duping Delight” theory that “when you're fooling someone, you tend to take delight in it,” Sen explained.
“Smiling or laughing during one's sleep, on some level, relates to the subconscious mind attending to unresolved issues or unwinding from pent-up feelings and thoughts,” says Esmaeilpour.
This study indicates that smiles are not restricted to neonate sleep but persist during adult human sleep. Indeed, 8% of 100 subjects without parasomnia smiled asleep, 7% in REM sleep and 1% in N2 sleep. Rare patients with sleepwalking also smiled and laughed during N2, REM sleep and during N3 parasomnia.
Babies very quickly develop their own typical facial expressions. By six months old, some babies smile more and some less. These differences seem to be related to the baby's temperament and affective style [4]. The patterns of individual facial movement, however, are similar in families and appear to be inherited.
If you see your baby grimacing in their sleep, you may worry that they're having a bad dream. However, this is unlikely. It's more likely that your baby is simply passing wind. It's also worth noting that odd facial expressions, like grimacing, are often the result of an immature nervous system.
Smiling or laughing when disclosing trauma can be an indicator of shame. Some trauma survivors hold deeply entrenched feelings of self-blame and other distorted and inaccurate thoughts about the role they believe they played in their abuse.
Studies show that a nice smile makes you more attractive to potential partners, and in a 5500-people survey conducted by Match.com, 58% of men and 71% of women ranked teeth as the most attractive asset their date can have.
However, laughter in isolation during non-REM (NREM) sleep or sleep-wake transition without associated parasomnia or arousal is quite uncommon. Epileptic seizures involving laughter are termed gelastic seizures. These consist of unnatural, forceful laughter, with or without mirth [1].
The rarest smile type is the complex smile, with only an estimated 2% of the population possessing this smile.
Fight Depression
Smiling acts like a natural antidepressant—when you smile, your brain releases serotonin, a mood stabilizer. Many medications for anxiety and depression focus on increasing serotonin levels in your brain, but smiling can increase serotonin all on its own, without any negative side effects.
Babies with autism smile but may not smile as much as babies without autism. Typically, a baby will smile back at you as early as six weeks, but certainly by four months. Children with autism tend to lack social smiling in response to your gestures.
Top Signs Your Baby May Be Gifted
“In adults, the bones are fused and won't move because of sleep position. So, sleeping on one side will not change your bone structure. Over the years, though, constant pressure on one side can contribute to subtle aging changes like looser skin, deeper lines, or earlier jowl formation.
These are known as “endogenous smiles“, which means they're generated internally rather than a response to an external stimulus. Essentially, these smiles are a part of the baby's natural sleep cycle and brain development.
Passing wind or having sudden relief from an uncomfortable tummy may also have something to do with it, but it's not been scientifically proven. Whatever the reason, just enjoy those gorgeous sleepy newborn smiles while they last! The real thing will happen soon enough and when it does, you'll know the difference.
Talking in your sleep is a kind of parasomnia, or a disruptive sleep-related disorder that happens while you're sleeping. Unlike other parasomnias like sleepwalking or sleep-related eating disorder that can carry significant risks to your health and well-being, sleep talking usually has little to no risk.
Smiling when discussing trauma is a way to minimize the traumatic experience. It communicates the notion that what happened “wasn't so bad.” This is a common strategy that trauma survivors use in an attempt to maintain a connection to caretakers who were their perpetrators.
These common behaviors and signs of sexsomnia include: