A new study published in the British Journal of Ophthalmology suggests that sleep posture, particularly pillow use, may influence eye health and pressure regulation. Research indicates that sleeping without a pillow may help reduce elevated pressure inside the eye, a key risk factor for glaucoma, the leading cause of irreversible blindness worldwide. High intraocular pressure (IOP) can damage the optic nerve, making sleep positioning an important consideration for eye health.
Study Methodology and Participants
Researchers studied 144 adults with glaucoma, including 84 people aged 44 or younger, 41 between ages 45 and 59, and 19 aged 60 or older. Participants provided detailed medical histories from October 2023 to April 2024 and received full eye exams. Researchers measured IOP in the right eye every 2 hours over a 24-hour period, both while sitting and lying down, with participants’ heads raised to an angle of 20 to 35 degrees using two standard pillows.
Key Findings
A total of 96 participants, or 67 percent, showed a clear rise in IOP when their head was elevated compared to lying flat, with pressure increasing by approximately 1.61 mm Hg on average. Overall, IOP was higher in the elevated position than the flat position (17.42 mm Hg versus 16.62 mm Hg), with greater fluctuation over the 24-hour period. Additionally, ocular perfusion pressure (OPP), which reflects blood flow to the eye, decreased when two pillows were used, suggesting reduced delivery of oxygen and nutrients to eye tissues. Younger adults were more likely than older participants to experience larger increases in IOP.
Mechanism and Clinical Implications
Researchers theorize that stacking pillows changes the angle of the neck, which may compress the jugular vein and interfere with normal drainage of aqueous humor. The researchers suggest that “patients with glaucoma may therefore benefit from avoiding sleeping postures that induce jugular venous compression to mitigate postural IOP elevation,” representing “a simple yet potentially effective adjunctive strategy for optimizing long-term IOP management.”
This article is an AI-assisted summary. All facts and figures are drawn from the original report: https://scitechdaily.com/the-surprising-reason-you-might-want-to-sleep-without-a-pillow/