Eye covers are used to block out light while sleeping, especially useful in environments with constant light such as the Arctic. The speaker mentions needing one during a trip to the Arctic National Wildlife Refuge.
went up to the Arctic went up to Arctic National Wildlife Refuge to check that place out and 24 hours of sun, right? land in the midnight sun. Uh, never gets dark and I was the only person on that trip who didn't bring like some sort of an eye cover to sleep with
""The speaker mentions that everyone on the trip to the Arctic, except them, brought an eye cover to help them sleep in the constant sunlight."