Graham Greene said this quote

That was the worst period of all: it is my profession to imagine, to think in images: fifty times through the day, and immediately I woke during the night, a curtain would rise and the play would begin: always the same play, Sarah making love, Sarah with X, doing the same things that we had done together, Sarah kissing in her own particular way, arching herself in the act of sex and uttering that cry like pain, Sarah in abandonment. I would take pills at night to make me sleep quickly, but I never found any pills that would keep me asleep till daylight.