Herbie Murray
Sleep is a complex and mysterious body process that allows the body and brain to rest, repair, and restore. While the muscles of the body are paralysed during sleep, the eyes remain active and continue to move, especially during a type of sleep called REM (rapid-eye movement) sleep, which is when we dream. During non-REM sleep, eye movements slow down and eventually stop. The reasons for rapid eye movement during REM sleep are not entirely known, but some studies suggest that our eyes are following images in our dreams.
| Characteristics | Values |
|---|---|
| Eye movements during sleep | A normal part of the sleep cycle |
| Sleep cycles | Non-rapid eye movement (non-REM) and rapid eye movement (REM) |
| Eye movements during non-REM sleep | Slow down and eventually stop |
| Eye movements during REM sleep | Move rapidly |
| Dreaming | Happens during REM sleep |
| Eye movements during sleep | Fastest movements produced by the human body, reaching angular speeds of 900 degrees per second |
| Sleep | Allows the body and brain to rest |
| Sleep | A complex and mysterious body process |
| Sleep | Linked to quality of life |
| Sleep | Vital for "brain plasticity", or the brain's ability to adapt to input |
| Sleep | Promotes the removal of waste products from brain cells |
| Sleep | Lack of it is linked to many health issues |
| Sleep | Needed to function properly |
| Eye lubrication | Eyelids lubricate the eyes so they don't dry out |
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What You'll Learn
- Eye movements during sleep are a normal part of the sleep cycle
- The sleep cycle is divided into two main types: non-rapid eye movement (non-REM) and rapid eye movement (REM)
- During REM sleep, the eyes move rapidly behind closed eyelids
- Dreaming happens during REM sleep
- Nocturnal lagophthalmos is when people sleep with their eyes open
Eye movements during sleep are a normal part of the sleep cycle
Sleep is a normal body process that allows the body and brain to rest, repair, and restore. While you sleep, your brain cycles repeatedly 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 lids, and brain activity is similar to that during wakefulness.
The movement of each eye during sleep is controlled by the action of six extraocular muscles. Lateral and medial recti control eye movements in the horizontal plane, while superior and inferior recti and superior and inferior oblique muscles are involved in the control of vertical and torsional movements. Abducting and adducting movements are controlled by the abducens (ABD) and oculomotor nucleus, respectively.
During REM sleep, the eyes move rapidly along the naso-temporal axis, and the direction of these movements is well correlated across both eyes. These rapid eye movements, also known as saccades, are the fastest movements produced by the human body, reaching angular speeds of 900 degrees per second. While the reason for these eye movements during REM sleep is not entirely known, some studies suggest that they enable people to change scenes while dreaming. Other studies indicate that the left and right eyes move separately.
In summary, eye movements during sleep are a normal part of the sleep cycle, with REM sleep accounting for about 25% of your total time asleep.
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The sleep cycle is divided into two main types: non-rapid eye movement (non-REM) and rapid eye movement (REM)
During REM sleep, the eyes move rapidly behind closed eyelids. Dreaming happens during REM sleep, and dreams tend to be more vivid and intense. The REM phase is also known as paradoxical sleep or desynchronized sleep because of its physiological similarities to waking states, including rapid, low-voltage desynchronized brain waves. The core body and brain temperatures increase during REM sleep, while the skin temperature drops to its lowest values. The electrical and chemical activity regulating this phase seems to originate in the brain stem and is characterised by an abundance of the neurotransmitter acetylcholine.
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During REM sleep, the eyes move rapidly behind closed eyelids
Sleep is a complex and mysterious body process that has puzzled researchers and experts for many years. While sleeping, the human body cycles repeatedly through two main types of sleep: non-rapid eye movement (non-REM) and rapid eye movement (REM). During non-REM sleep, eye movements slow down and eventually stop. However, during REM sleep, the eyes exhibit rapid movements behind closed eyelids, a phenomenon known as saccades. These eye movements are the fastest produced by the human body, reaching angular speeds of 900 degrees per second.
The question of why the eyes move rapidly during REM sleep has intrigued scientists for decades. Some studies suggest that these movements enable people to change scenes or follow images in their dreams. For example, Aserinsky & Kleitman (1953) observed a correlation between periods of rapid eye movements and dreams with high visual content. They proposed that eye movements during REM sleep are related to the exploration of visual scenes within dreams.
However, other research suggests that the left and right eyes move independently during REM sleep, indicating that the movements may not be directly linked to dream content. More recent studies have utilized head-mounted cameras on mice to quantify the direction and amplitude of rapid eye movements during REM sleep. These studies found that the direction of these movements was well-correlated across both eyes, similar to saccades observed in awake animals, but with smaller amplitudes and higher frequencies.
While the exact purpose of eye movements during REM sleep remains elusive, it is clear that they are a normal part of the sleep cycle. Dreaming occurs during REM sleep, and the brain activity during this stage resembles that of wakefulness. Additionally, the body becomes temporarily paralyzed during REM sleep, and the breath rate increases. Throughout a typical night, individuals cycle through REM and non-REM sleep four to five times, with each subsequent REM cycle being longer than the last.
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Dreaming happens during REM sleep
REM sleep is important for several reasons. Firstly, it plays a role in memory consolidation. During this stage of sleep, the brain processes new learnings and motor skills from the day, deciding which ones to commit to memory and which ones to delete. This process of brain maintenance helps in reorganising and cataloguing memories and learned information, making it easier to access and retrieve them.
REM sleep is also important for emotional processing. Dreams during REM sleep are often vivid and emotionally charged, and this may be linked to the activation of the amygdala, the part of the brain responsible for processing emotions.
Additionally, REM sleep contributes to healthy brain development. While the specific purpose of REM sleep remains unknown, some researchers have suggested that dreaming during this stage may reinforce behaviours that are not commonly encountered while awake, such as aggression or fearful situations. However, it is important to note that dreams can also occur during non-REM sleep stages, and the occurrence of dreams is not limited solely to REM sleep.
The understanding of REM sleep and its connection to dreaming has evolved over time. While early researchers such as Aserinsky & Kleitman (1953) observed a correlation between REM sleep and dreams with high visual content, more recent studies have shown that dreams during non-REM sleep are more conceptual and less vivid. Despite this, the majority of dreams still occur during REM sleep, and they tend to be more emotionally intense and vivid compared to non-REM dreams.
In summary, dreaming predominantly happens during REM sleep, but it is not limited solely to this stage. REM sleep is important for memory consolidation, emotional processing, and brain development. While the exact purpose of dreaming remains a mystery, it is clear that it plays a crucial role in our overall brain function and mental health.
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Nocturnal lagophthalmos is when people sleep with their eyes open
While asleep, the human body cycles through two main types of sleep: non-rapid eye movement (non-REM) and rapid eye movement (REM). During non-REM sleep, eye movements slow down and eventually stop. In REM sleep, the eyes move rapidly behind closed eyelids. Dreaming occurs during REM sleep.
However, about 5% of the population sleeps with their eyes open. This condition is called nocturnal lagophthalmos. It is characterized by the inability to close one or both eyes completely during sleep. Nocturnal lagophthalmos can be caused by various factors, including:
- Facial nerve damage: Paralysis or weakness of the facial nerve or the orbicularis oculi muscle, which is responsible for closing the eyelids. Conditions such as Moebius syndrome, a rare neurological disorder, can cause muscle weakness or paralysis.
- Eyelid damage: This includes short or weak eyelids, scarring from physical trauma or chemical burns, and conditions like Lax eyelid syndrome (LES) or floppy eyelid syndrome (FES).
- Anatomical differences: Protruding or sunken eyes, also known as proptosis or exophthalmos, can prevent the eyelids from fully closing.
- Behavioral differences: Certain behaviors before sleeping may contribute to nocturnal lagophthalmos.
- Genetic factors: In some cases, there may be no apparent underlying condition, and the tendency to sleep with eyes open could be hereditary.
Nocturnal lagophthalmos can lead to reduced sleep quality due to the discomfort of dry eyes. Treatment options include:
- Moisture goggles: Wearing specialized goggles at night helps moisturize the eyes during sleep.
- Eye ointments: Applying artificial tears or protective ointments to the eyes and cornea can prevent dryness, itching, and scratches.
- External eyelid weight: Small weights or surgical tape can be placed on the eyelids to keep them closed during sleep.
- Lifestyle changes: Avoiding sleeping pills and practicing blinking more frequently during the day can help improve eye moisture.
- Surgery: In severe cases, surgery may be recommended, involving the insertion of a gold implant above the lashes to weigh down the eyelid.
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Frequently asked questions
The eyes do work while we sleep, but in a different way than when we are awake. During non-rapid eye movement (non-REM) sleep, eye movements slow down and eventually stop. In rapid eye movement (REM) sleep, the eyes move rapidly behind closed eyelids. Dreaming occurs during REM sleep.
The reason why eyes move during REM sleep is not entirely known. Some studies suggest that the eyes follow images in our dreams, while other studies indicate that the left and right eyes move separately.
REM sleep and non-REM sleep are two different types of sleep that the body cycles through repeatedly. Non-REM sleep is composed of four stages, including light sleep and deep sleep. In REM sleep, the eyes move rapidly, the breath rate increases, and the body becomes temporarily paralyzed as we dream.
