The Quiet Science Behind a Cat's Sleeping Habits

Domestic felines are renowned for their dedication to rest, often spending up to sixteen hours a day in various states of slumber. While most of this time is spent in light snoozing, cats occasionally enter a deep, restorative sleep phase where their muscles fully relax. It is during these moments of profound tranquility that unique behaviors, such as a slightly protruding tongue, become visible.

A grey and white tabby cat with its eyes closed and tongue sticking out slightly is sleeping on a brown sofa. The cat is lying on its side, with its paws hanging loosely. In the background, there is a beige patterned wallpaper and a brown quilted blanket draped over the back of the sofa. The scene appears to be indoors, in a domestic setting, likely in Moscow, Russia.

Iren

Moscow, Russia · Sep 10, 2026, 7:41 PM · 1.6k attention

This endearing sight, often referred to informally as a "blep," typically occurs when a cat is exceptionally relaxed. The muscles in the jaw loosen to the point where the mouth opens slightly, allowing the tip of the tongue to slip past the teeth. It is a sign of complete comfort and safety in their environment, indicating that the animal feels entirely secure.

A fluffy, grey and black tabby cat is sleeping on its side on a brown sofa, with its head resting on the edge of the sofa. The cat's eyes are closed, and its pink tongue is slightly sticking out. The background consists of patterned wallpaper and a draped brown blanket. The scene appears to be indoors, possibly in a residential setting, in Moscow, Russia.

Iren

Moscow, Russia · Sep 10, 2026, 7:42 PM · 0.9k attention

Beyond simple relaxation, the phenomenon can also be linked to the sensory anatomy of the feline mouth. Cats possess a highly developed vomeronasal organ, used to detect chemical cues in the air. Sometimes, a cat will pause mid-scent with its mouth open, and if they drift off to sleep shortly after, the tongue simply remains in place.

A long-haired tabby cat is asleep on its side, stretched out horizontally across the top of a dark brown sofa. The cat is positioned in the center of the image, with its head resting on the sofa to the right. Its eyes are closed, and its mouth is slightly open, revealing its teeth and tongue. The cat's fur is a mix of gray, black, and white, with distinct tabby markings. Its front paws are extended forward, and its back legs are bent. The sofa is positioned in front of a wall with textured wallpaper featuring a damask pattern in light gray. To the left of the cat and sofa, a portion of a dark brown armchair is visible. The lighting is dim, casting shadows on the sofa and wall. The image appears to have been taken indoors, likely in a residential setting. There is no discernible information in the image that would place it in Moscow, Russia, or any other specific geographical location.

Iren

Moscow, Russia · Sep 10, 2026, 7:40 PM

Appreciating these quiet moments offers a glimpse into the domestic cat's natural rhythms. While their wild ancestors needed to remain constantly alert, the modern household pet enjoys the luxury of deep, undisturbed rest on soft upholstery. This shift highlights the successful adaptation of felines to peaceful cohabitation in human spaces.

A close-up, eye-level, horizontal medium shot captures a domestic cat sleeping peacefully on a brown upholstered surface, likely a sofa or bed. The cat, a tabby with gray, brown, and black stripes, is curled on its side with its eyes closed and its pink tongue sticking out slightly. Its fur appears soft and long. Behind the cat, a wall is visible, decorated with a light-colored textured wallpaper featuring an embossed floral pattern in shades of beige and gold. The lighting suggests an indoor setting, possibly a home in Moscow, Russia.

A grey and white tabby cat with its eyes closed and tongue sticking out slightly is sleeping on a brown sofa. The cat is lying on its side, with its paws hanging loosely. In the background, there is a beige patterned wallpaper and a brown quilted blanket draped over the back of the sofa. The scene appears to be indoors, in a domestic setting, likely in Moscow, Russia.

A fluffy, grey and black tabby cat is sleeping on its side on a brown sofa, with its head resting on the edge of the sofa. The cat's eyes are closed, and its pink tongue is slightly sticking out. The background consists of patterned wallpaper and a draped brown blanket. The scene appears to be indoors, possibly in a residential setting, in Moscow, Russia.

A long-haired tabby cat is asleep on its side, stretched out horizontally across the top of a dark brown sofa. The cat is positioned in the center of the image, with its head resting on the sofa to the right. Its eyes are closed, and its mouth is slightly open, revealing its teeth and tongue. The cat's fur is a mix of gray, black, and white, with distinct tabby markings. Its front paws are extended forward, and its back legs are bent. The sofa is positioned in front of a wall with textured wallpaper featuring a damask pattern in light gray. To the left of the cat and sofa, a portion of a dark brown armchair is visible. The lighting is dim, casting shadows on the sofa and wall. The image appears to have been taken indoors, likely in a residential setting. There is no discernible information in the image that would place it in Moscow, Russia, or any other specific geographical location.