What is "midnights"

Usage examples of "midnights".

I begin to think of the wide seas and the clouds and the eery midnights to the light of Skay and the Happy Isles lifting over the horizon.

But when the wind is fresh and the kites are charged and the boat surges down the swells—then one forgets the Skay-lit midnights, and Jorgoso on the Sea of Chills.

Bring it to me before three midnights hence, and I will turn over the evidence to you.