Sleeping Without a Pillow Could Have Surprising Health Benefits, Study Suggests — Particularly for Glaucoma Patients

Emerging research suggests that the way people position their heads during sleep — including the number of pillows they use — may have measurable effects on intraocular pressure, a key risk factor in glaucoma. The findings have prompted sleep experts and ophthalmologists to weigh in on the broader question of whether sleeping without a pillow could carry surprising health benefits for certain populations.

The study centers on a well-established medical principle: intraocular pressure tends to rise when the head is positioned at or below heart level. When a person lies flat, blood and aqueous humor — the fluid inside the eye — can accumulate more readily, increasing pressure on the optic nerve. For healthy individuals, this nocturnal rise in IOP is generally insignificant. But for the estimated 3 million Americans living with glaucoma, even modest and sustained increases in eye pressure during the roughly eight hours spent asleep each night can accelerate damage to the optic nerve, potentially leading to vision loss. The new research builds on earlier findings by examining the specific role of pillow stacking. While intuitively one might assume that more pillows elevate the head further and thus reduce IOP, the study suggests that the neck flexion and head angle caused by stacked pillows can paradoxically compress blood vessels and impede venous drainage from the head, potentially worsening the problem rather than alleviating it.

Beyond the ophthalmological implications, the research has reignited a broader discussion about pillow use and sleep posture in general. Sleep medicine specialists have long debated the optimal head support for different types of sleepers. For stomach sleepers, eliminating a pillow can reduce neck strain by keeping the spine in a more neutral position, since a thick pillow forces the head into an upward angle that hyperextends the cervical spine. Conversely, back sleepers and side sleepers generally benefit from a pillow that fills the gap between the neck and the mattress, maintaining the natural cervical curve and preventing muscle strain. The American Academy of Sleep Medicine has not issued formal recommendations on pillow use specifically, but its guidelines emphasize that sleep environment customization — including mattress firmness, room temperature, and head support — plays an important role in sleep quality and, by extension, overall health. Some chiropractors and physical therapists have advocated for lower-profile pillows or specialized cervical support pillows rather than complete pillow elimination, noting that abruptly removing a pillow can cause temporary discomfort and disrupt sleep patterns.

The glaucoma dimension of this research carries particular urgency because the disease is often called the “silent thief of sight” — approximately half of people with glaucoma in the United States are unaware they have the condition, according to the Glaucoma Research Foundation. The disease disproportionately affects older adults, African Americans, and individuals with a family history of the condition. Current treatments focus primarily on lowering IOP through eye drops, laser therapy, or surgical intervention. If sleep positioning proves to be a meaningful modifiable risk factor, it could represent a simple, cost-free adjunct to existing treatment strategies. Previous studies published in journals such as “Ophthalmology” and the “Journal of Glaucoma” have demonstrated that sleeping on the side with the affected eye positioned downward correlates with greater visual field loss in that eye, lending additional credibility to the idea that nocturnal posture matters in disease management.

Looking ahead, researchers say larger, longitudinal studies will be necessary to determine whether changes in pillow use can produce clinically meaningful reductions in glaucoma progression over time. The current study adds to a growing body of evidence that sleep hygiene extends well beyond simply getting enough hours of rest — it encompasses the physical mechanics of how we position our bodies during the night. For now, experts recommend that glaucoma patients discuss sleep positioning with their ophthalmologists as part of a comprehensive treatment plan, and that individuals considering going pillow-free do so gradually while paying attention to how their neck, back, and overall sleep quality respond to the change.