Spock doesn't need to sleep, but he does enjoy letting his T'hy'las use him as an pillow.

He glanced down and smiled softly as he saw that Bones had stolen the comforter and wrapped himself into a tight burrito, as Jim was nearly on top of Spock, with his legs tangled with Spock's and his arm over the Vulcan's chest.

Spock then looked at the small panel on the wall that had a clock, and noticed the time was nearing 2am earth time.