Sleeping without pillows may help lower high internal eye pressure, build-up of which causes optic nerve damage and glaucoma-the leading cause of irreversible blindness worldwide–in people with the condition, suggests preliminary research, published online in the British Journal of Ophthalmology. Stacked pillows alter neck position, which may compress the jugular vein, thereby preventing the natural drainage of aqueous humor, explain the researchers. This fluid nourishes eye tissues without a blood supply like the cornea and lens and helps maintain eye shape and pressure. Their right eye IOP was measured every 2 hours for 24 hours, both when sitting and when lying down. “Patients with glaucoma may therefore benefit from avoiding sleeping postures that induce jugular venous compression to mitigate postural IOP elevation.