“sleep with one eye open.” - a photo on Flickriver

            You may have heard the phrase “sleep with one eye open.” While it’s usually meant as a metaphor about protecting yourself, you may wonder if it’s actually possible to sleep with one eye open and one closed.

There are a variety of medical conditions that may make it impossible to close your eyes when you sleep. Some of these may lead to sleeping with one eye open and one eye closed.

Unihemispheric sleep is when one half of the brain sleeps while the other is awake. It mostly happens in risky situations, when some sort of protection is necessary.

Unihemispheric sleep is most common in certain aquatic mammals (so they can keep swimming while they sleep) and birds (so they can sleep on migratory flights).

There’s some evidence that humans have unihemispheric sleep in new (or risky) situations. In sleep studies, data shows that one brain hemisphere is in less deep sleep than the other during the first night of the new situation.

Because one-half of the brain is awake in unihemispheric sleep, the eye on the side of the body that the awake hemisphere of the brain controls may stay open during sleep.

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Taken in: UK / England / Mid Devon District / Hemyock (show map)

Taken on: January 2, 2022

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Camera: Olympus E-M1MarkII, f/4.5, 1/100 sec, 24mm (=48mm), ISO 64 (more info) (hide info)

Camera:	Olympus E-M1MarkII
Lens:	OLYMPUS M.12-45mm F4.0
Aperture:	f/4.5
Exposure Time:	0.01 sec (1/100)
Focal Length:	24mm (35mm equivalent: 48mm)
ISO:	64
Exposure Bias:	0 EV
Flash:	No Flash
Exposure Program:	Manual
Exposure Mode:	Manual
Metering Mode:	Spot
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Adobe Photoshop Lightroom 3.6 (Windows)
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