Herbie Murray
Sleep accounts for a significant portion of our lives, and while we sleep, our eyes cycle through stages of rapid and non-rapid eye movement (REM and non-REM). During non-REM sleep, eye movements slow down and eventually stop, while in REM sleep, the eyes move rapidly behind closed lids. Dreaming occurs during REM sleep, and research suggests that these rapid eye movements may enable people to change scenes in their dreams. Additionally, eyelids play a crucial role in sleep, acting as a protective barrier and providing lubrication to the eyes. However, some individuals experience nocturnal lagophthalmos, a condition where they sleep with their eyes partially or fully open, which can impact sleep quality. Understanding the connection between sleep and eye movements provides insights into the complex processes that occur during sleep and their implications for our overall health and well-being.
| Characteristics | Values |
|---|---|
| Sleep cycles | Non-rapid eye movement (non-REM) and rapid eye movement (REM) |
| Non-REM sleep | Eye movements slow down and eventually stop |
| REM sleep | Eyes move rapidly behind closed eyelids |
| Dreaming | Occurs during REM sleep |
| Sleep and the brain | Brain activity increases during REM sleep and is similar to brain waves when awake |
| Sleep and the body | Body becomes temporarily paralyzed during REM sleep |
| Sleep and the eyes | Eyelids act as a protective barrier, keeping the eyes safe from debris and preventing them from drying out |
| Nocturnal lagophthalmos | A condition where people sleep with their eyes partially or fully open |
| Microsleep | Episodes of one or two seconds of sleep while the eyes are open |
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What You'll Learn
Eye movements during REM sleep
Sleep is divided into two main types: non-rapid eye movement (non-REM) sleep and rapid eye movement (REM) sleep. During non-REM sleep, eye movements slow down and eventually stop. However, during REM sleep, the eyes move rapidly behind closed eyelids. This phase of sleep is characterised by increased brain activity, limited muscle movement, darting eye movement, and fluctuating respiration and heart rate. Dreaming also occurs during REM sleep.
REM sleep was first discovered in the 1950s when scientists noticed that sleeping infants exhibited distinct periods of rapid eye movements. Since then, researchers have gathered more data about this sleep stage, including its prevalence in other mammals and animals.
The purpose of eye movements during REM sleep has been a subject of debate among experts. Some research suggests that these rapid eye movements allow people to change scenes while dreaming. A recent study by researchers at the University of California, San Francisco (UCSF) supports this idea. The study found that eye movements during REM sleep correspond to the dream world created by the brain. By comparing data on the heading directions of mice and their eye movements during REM sleep, the researchers observed a precise alignment between the two.
Furthermore, the eye movements during REM sleep may be shorter in duration and more likely to loop back to their starting point. About seven such loops occur during one minute of REM sleep. While the eyes of a paradoxical sleeper move in tandem, they drift apart during slow-wave sleep. These eye movements follow the ponto-geniculo-occipital (PGO) waves that originate in the brain stem. However, the direct relationship between eye movements and dreaming has not been clearly established. An alternative explanation suggests that the functional purpose of REM sleep is for procedural memory processing, and the rapid eye movement is a byproduct of the brain processing eye-related procedural memory.
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Eye lubrication
During sleep, the eyes cycle through stages of rapid and non-rapid eye movement (REM and non-REM sleep). While non-REM sleep is a deeper sleep where the body temperature drops and heart rate and breathing regulate, REM sleep is when dreams occur, and the eyes move rapidly behind closed lids.
The eyelids play an important role in getting a good night's sleep. They act as a protective barrier, keeping the eyes safe from debris. They also prevent the eyes from drying out by providing lubrication. This is important because, during the day, the cornea gets oxygen from the air, but during sleep, it relies on the gelatinous fluid and tears for nourishment.
Some people sleep with their eyes partially or fully open, a condition called nocturnal lagophthalmos. This can be caused by faulty eyelid mechanics, facial nerve disorders, structural changes in the face, or sedatives such as alcohol and sleeping pills. People who sleepwalk or talk in their sleep may also have their eyes open. Nocturnal lagophthalmos can lead to poor sleep quality, possibly due to the discomfort of dry eyes and the visual stimulation caused by light entering the eyes.
To prevent eye dryness and ensure adequate lubrication, it is recommended to remove contact lenses before sleeping. Contact lenses can block oxygen from reaching the cornea, leading to swelling. Instead, wearing glasses before bed allows the eyes to recover and provides a barrier to protect the eyes from debris and prevent dryness.
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Sleep with eyes open
Sleep is a period during which the brain engages in various activities necessary for life and closely linked to one's quality of life. Throughout our sleep, our brains cycle through two different types of sleep: REM (rapid-eye movement) sleep and non-REM sleep. During non-REM sleep, our eye movements slow down and eventually stop. In REM sleep, our eyes are closed but move rapidly behind our eyelids.
While closing our eyes is a defining feature of sleep, some people sleep with their eyes partially or fully open due to a condition called nocturnal lagophthalmos. Nocturnal lagophthalmos can be caused by faulty eyelid mechanics, facial nerve disorders, structural changes in the face, Bell's palsy, Lyme disease, injuries, excessive alcohol consumption, and certain sedatives or sleeping pills. People who sleepwalk or talk in their sleep may also have their eyes open, but usually only during the episode.
People with nocturnal lagophthalmos tend to have poor sleep quality, likely due to discomfort and visual stimulation from light entering through their open eyelids. This condition can be diagnosed by a doctor through observing the eyes from a distance and discussing symptoms, predisposing conditions, and family history.
In addition to nocturnal lagophthalmos, there are instances of microsleep, which are episodes of one or two seconds of sleep that can occur while the eyes are open. These can happen when driving or during a meeting, for example, and are caused by exhaustion.
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Microsleep episodes
During sleep, the eyes cycle through stages of rapid and non-rapid eye movement. In the first stage, between being awake and falling asleep, eye movements slow down and eventually stop. During the second stage of light sleep, the heart rate and breathing regulate, and body temperature drops. In the third and fourth stages, deep sleep is achieved. As one cycles into REM sleep, the eyes move rapidly behind closed lids, and brain waves are similar to those during wakefulness. The breath rate increases, and the body becomes temporarily paralyzed as one dreams. Dreaming is also associated with rapid eye movements, known as saccades.
The first step in managing microsleep episodes is recognizing the signs of fatigue and addressing the underlying causes. Sleep experts emphasize the importance of not ignoring tiredness and pushing through it, especially when engaging in activities that require sustained attention. Additionally, certain medications and medical conditions can contribute to microsleep episodes, underscoring the need for comprehensive evaluation and personalized interventions.
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Oxygen deprivation from contacts
The cornea, the outermost layer of the eye, does not have any blood vessels and relies on oxygen from the atmosphere, which dissolves in the tear film that coats the eye. When a person is asleep, their eyes are closed, reducing the amount of oxygen available to the cornea. Contact lenses can make it more difficult for the cornea to receive oxygen, as they act as an additional barrier.
Sleeping with contact lenses in can therefore lead to oxygen deprivation in the eyes, also known as corneal hypoxia. This condition can cause blurred vision, burning, excessive tearing, and a scratchy feeling in the eyes. Mild cases of corneal hypoxia can result in swelling in the epithelial layer of the cornea and temporary blurred vision. More severe cases can lead to the death of epithelial cells, causing permanent damage to the cornea.
Additionally, the risk of infection increases when sleeping with contact lenses. Soft contacts tend to retain water, but they can also trap debris and bacteria that enter the eye during the day. Sleeping with contacts provides an optimal environment for bacteria to thrive, increasing the likelihood of eye infections.
Approximately one-third of contact lens wearers admit to sleeping with their contacts in, despite the potential risks to eye health. While daily wear contacts can be worn for extended periods during the day, it is not advisable to sleep with them. Even occasional overnight use can impact eye health negatively.
To maintain optimal eye health, it is crucial to remove contact lenses before sleeping and to follow proper contact lens hygiene practices, including regular cleaning and replacement as instructed by eye care professionals.
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Frequently asked questions
Throughout your time asleep, your brain will cycle through two different types of sleep: REM (rapid-eye movement) sleep and non-REM sleep. During non-REM sleep, your eye movements slow down and eventually stop. In REM sleep, your eyes move rapidly behind closed eyelids. Dreaming happens during REM sleep.
During REM sleep, your eyes move rapidly behind closed eyelids. Some research shows that these rapid eye movements enable people to change scenes while dreaming.
Nocturnal lagophthalmos is a condition where people sleep with their eyes partially or fully open. This is caused by faulty eyelid mechanics, facial nerve disorders, structural changes in the face, Bell's palsy, Lyme disease, injuries, or excessive alcohol and sedatives.
