The mornings themselves were becoming bad now as I wandered
about lethargic, following my synthetic sleep, but afternoons were
still the worst, beginning at about three o'clock, when I'd feel the
horror, like some poisonous fog bank roll in upon my mind, forcing me
into bed.

Darkness visible: a memoir of madness (ed. Random House Incorporated, 1990) - ISBN: 9780394588889