Glaucoma is one of the leading causes of irreversible blindness worldwide, affecting millions of people. The condition damages the optic nerve, which is responsible for transmitting visual information from the eye to the brain. In most cases, this damage is strongly linked to elevated intraocular pressure (IOP), meaning the pressure inside the eye becomes too high and gradually harms the nerve fibers.
Because of this, controlling intraocular pressure is the central goal of glaucoma treatment. Patients are often prescribed medicated eye drops, laser procedures, or surgery to reduce pressure. However, researchers are increasingly interested in how everyday habits—including sleep position—may also influence eye pressure.
A recent study published in the British Journal of Ophthalmology explored an unexpected factor: pillow height during sleep. The researchers examined how the position of the head and neck affects intraocular pressure during the night. Their findings suggest that sleeping with a very thin pillow—or in some cases without a pillow—may help reduce intraocular pressure in certain people with glaucoma.
The mechanism behind this effect appears to be related to the position of the neck and the circulation of blood and fluids around the eyes. When a person sleeps with a thick pillow, the head is often elevated and the neck bends forward at a sharper angle. This position can partially compress the jugular veins, which are responsible for draining blood from the head back to the heart.
When venous drainage is reduced, pressure can build up in the vessels surrounding the eyes. This may interfere with the normal circulation of aqueous humor, the fluid inside the eye that helps maintain its shape and nourishes internal tissues. If this fluid does not drain efficiently, intraocular pressure can increase.
By contrast, when the head and neck remain in a more neutral and aligned position—such as when using a very thin pillow or no pillow at all—the jugular veins may remain less compressed. This could allow better venous drainage and help stabilize pressure within the eye.
The study highlights the importance of body posture during sleep, particularly for individuals already diagnosed with glaucoma. Nighttime eye pressure fluctuations are an important but sometimes overlooked factor in disease progression. Many patients experience higher intraocular pressure while lying down compared with when they are sitting or standing.
Researchers emphasize that pillow height alone is not a treatment for glaucoma. Medical therapy remains essential for controlling the disease and preventing vision loss. However, simple adjustments in sleep posture could potentially complement existing treatments and help reduce pressure fluctuations during the night.
Ophthalmologists also note that more research is needed to fully understand how sleep position influences eye pressure and whether these findings apply to all patients with glaucoma. Factors such as mattress type, sleeping position (on the back or side), and individual anatomy may also play a role.
Still, the study offers an intriguing reminder that small lifestyle factors can affect eye health in ways people might not expect. For individuals living with glaucoma, something as simple as reconsidering pillow height could become part of a broader strategy to protect vision and support long‑term eye health.
