On Insomnia

"Insomnia is a variant of Tourette's--the waking brain races, sampling the world after the world has turned away, touching it everywhere, refusing to settle, to join the collective nod. The insomniac brain is a sort of conspiracy theorist as well, believing too much in its own paranoiac importance--as though if it were to blink, then doze, the world might be overrun by some encroaching calamity, which its obsessive musings are somehow fending off."
— Jonathan Lethem (Motherless Brooklyn)

"I've always envied people who sleep easily. Their brains must be cleaner, the floorboards of the skull well swept, all the little monsters closed up in a steamer trunk at the foot of the bed."
— David Benioff (City of Thieves)

"The World is Very Flat, There is no doubt of that. (Night Thoughts of a tortoise suffering fom insomnia on a lawn)"
— E. V. Rieu

"The artist (I suppose) usually pays for the privilege by some sort of partial insomnia, by the possession of one faculty that will not be controlled nor put to sleep. In a poet this must often be the visual imagination, bringing before his eyes a succession of images which he never summoned, and of which some (it is only too likely) will be ugly or pitiful."
— Mary Lascelles (Jane Austen and Her Art)

"In its early stages, insomnia is almost an oasis in which those who have to think or suffer darkly take refuge."
— Colette