Sleeping with your eyes open is more than just a metaphor for being observant. Some people really do sleep with their eyes open—and it can damage their eyes and vision.
https://www.aao.org/eye-health/tips-prevention/sleeping-with-eyes-open
Sleeping with your eyes open is more than just a metaphor for being observant. Some people really do sleep with their eyes open—and it can damage their eyes and vision.
https://www.aao.org/eye-health/tips-prevention/sleeping-with-eyes-open