Evie Summers
Geckos are fascinating creatures with some unique sleeping habits. While some gecko species, such as those from the subfamily Eublepharidae, do have functional eyelids, the majority of gecko species, including the well-known crested gecko, lack eyelids altogether. This raises an interesting question: How do geckos sleep without blinking or closing their eyes? It turns out that geckos have some clever adaptations to manage sleep despite lacking eyelids.
| Characteristics | Values |
|---|---|
| Geckos with eyelids | Geckos of the subfamily Eublepharidae, including leopard geckos, banded geckos, and fat-tailed geckos |
| Geckos without eyelids | Crested geckos, tokay geckos, day geckos, house geckos, and satanic leaf-tailed geckos |
| Eye protection | Geckos without eyelids have a thick, protective membrane or transparent scale, known as a "spectacle," that covers and protects their eyes |
| Eye cleaning | Geckos use their tongues to keep their eyes clear of debris, moist, and lubricated, and they also shed the eye scale to maintain clear vision |
| Sleep indicators | Constricted pupils, sunken eyes, and relaxed crests (in the case of crested geckos) indicate that a gecko is asleep |
| Sleeping habits | Geckos typically sleep during the day, hiding under tree bark, in cavities, or under leaves for protection from predators |
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What You'll Learn
Geckos with eyelids
Geckos of the subfamily Eublepharidae have eyelids. This is a small subfamily of only 18 described species, but they are found almost everywhere in the world. Examples of geckos with eyelids include leopard geckos (Eublepharis macularius), banded geckos (Coleonyx sp.) and fat-tailed geckos (Hemitheconyx caudicinctus).
Most of the nearly 1,500 described gecko species do not have eyelids. Instead, they have a clear or transparent scale, known as a spectacle, that covers the eye, much like the spectacles on snakes' eyes. Geckos without eyelids constrict their pupils as much as possible when they sleep. Well-known species that lack eyelids include tokay geckos (Gekko gecko), day geckos (Phelsuma sp.) and house geckos (Hemidactylus sp.).
Crested geckos are a species of gecko that does not have eyelids. They are usually found near trees where they sleep under bark or leaves during the day. At night, they feed, socialise, and explore their territory. They have specialised eyes that can see much better in the dark. When a crested gecko is awake, its crests "stand up", and its pupils are large and wide. When it is asleep, its crests lay flat, and its pupils are tiny slits.
While it may seem strange to humans, geckos without eyelids seem to have no problem sleeping with their eyes open. Their pupils constrict so much that very minimal light enters their eyes, allowing them to sleep.
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Geckos without eyelids
Geckos, like humans, require a good night's sleep. However, unlike humans, most geckos do not have eyelids. Geckos of the subfamily Eublepharidae are an exception, with around 18 species possessing eyelids and a nearly global distribution. These geckos include leopard geckos, banded geckos, and fat-tailed geckos.
For the majority of geckos without eyelids, a clear, protective membrane covers their eyes, much like the "spectacles" found on snakes' eyes. This membrane, also referred to as a scale, shields the gecko's eyes from external hazards and prevents them from drying out. Geckos use their tongues to keep this membrane clean, moist, and free of debris.
The sleeping patterns of geckos can vary, with some being nocturnal and others diurnal. Nocturnal geckos, like the crested gecko, are typically active at night, feeding, socializing, and exploring under the cover of darkness. Diurnal geckos, on the other hand, are active during the daytime. The pupil shape of geckos may offer a clue to their sleeping patterns, with elliptical pupils indicating nocturnal species and round pupils suggesting diurnal species.
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How to tell if a gecko is sleeping
Geckos, like humans, need a good night's sleep. Unlike humans, however, most geckos do not have eyelids. So how can you tell if your gecko is sleeping?
Firstly, it's important to know that geckos are mostly nocturnal, sleeping during the day and becoming active at night. In the wild, they typically sleep under tree bark or leaves, hiding from predators. In captivity, they still retain these natural instincts, so it's important to ensure they have access to hiding places.
To determine if your gecko is sleeping, you can look at its eyes. When awake, a gecko's pupils are large and wide, but when it's asleep, its pupils will be constricted, appearing as tiny slits. Its eyes may also appear slightly sunken compared to when it is awake.
Another way to tell if your gecko is sleeping is by observing its body language. For example, crested geckos have crests that "stand up" when they are awake and lay down flat when they are asleep.
It's worth noting that some gecko species do have eyelids and will shut their eyes when sleeping. These include leopard geckos, banded geckos, and fat-tailed geckos.
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Where geckos sleep
Geckos typically hide themselves in a cavity or other sheltered spaces when sleeping. They are usually found near trees where they sleep under bark or leaves during the day. They also hide themselves under tree bark or in crevices in rocks. In captivity, they sleep in hides, usually on the warm side.
Crested geckos, for example, are nocturnal and hide under the bark of trees or on the underside of leaves during the day. They are adapted to life in darkness and have specialized eyes that can see much better in the dark.
Geckos are also known to sleep in crevices or cracks in rocks. They will seek out a secure hiding place to sleep in. Some geckos may even sleep on the ground, though this is less common.
The sleeping behavior of geckos depends on their environment and whether they are nocturnal or diurnal. Nocturnal geckos will sleep during the day and be active at night, while diurnal geckos will be active during the day and sleep at night.
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Why geckos sleep with their eyes open
Geckos are fascinating creatures, and like most lizards, they do not have eyelids. This means that, yes, they sleep with their eyes open. While this may seem strange to us, it is perfectly normal for geckos and does not cause them any problems. They have a few adaptations that allow them to sleep with their eyes open and protect their eyes from debris, moisture loss, and predators.
Firstly, geckos have a thick, protective membrane that covers their eyes. This membrane is similar to a transparent scale, often called a "spectacle." This scale, like the one found on snakes' eyes, protects the eyes from harm and prevents them from drying out. Geckos use their tongues to keep this membrane clean and free of debris, ensuring their vision remains clear.
Secondly, geckos that lack eyelids have pupils that can constrict and become tiny slits when they are asleep, minimizing the amount of light entering their eyes. This is similar to how snakes control the amount of light entering their eyes without the use of eyelids. Additionally, geckos tend to hide themselves in sheltered places, such as under tree bark or leaves, when sleeping, providing further protection from potential threats.
Some geckos, however, do have eyelids. Geckos of the subfamily Eublepharidae, which includes leopard geckos, banded geckos, and fat-tailed geckos, have functional eyelids. This subfamily is relatively small, with only 18 described species, but they are found almost worldwide.
In summary, geckos that lack eyelids have evolved several adaptations to protect their eyes and sleep effectively. They have a protective membrane, constrict their pupils, and seek sheltered hiding places. While it may be unusual for humans to imagine sleeping with their eyes open, geckos manage it just fine and can still maintain healthy vision and sleep patterns.
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Frequently asked questions
Geckos without eyelids have a thick, protective membrane over their eyes, which acts as a protective layer. Their pupils also constrict as much as possible to block out light.
Geckos are usually nocturnal, sleeping during the day and hunting at night. To determine if a gecko is sleeping, you can look at its eyes and crests. When awake, its crests will stand up, and its pupils will be large and wide. When asleep, its crests will be flattened, and its pupils will be tiny slits.
Geckos have a clear, transparent scale, known as a spectacle, that covers their eyes. Geckos use their tongues to keep this scale clean and free of debris.
