All right,’ Nico relented. ‘Maybe a little …’ He managed to take off his aviator jacket and wad it into a pillow before he keeled over and began to snore.

With great power comes a great need to take a nap.

You drool in your sleep- Annabeth Chase

They rest for 10 hours a night, and if you keep them awake longer, they need to sleep more.

How sleep the brave, who sink to rest, / By all their country's wishes blest!

Sleep, Silence's child, sweet father of soft rest, Prince whose approach peace to all mortals brings Indifferent host to shepherds and kings;Sole comforter to minds with grief opprest