He would never have gone to his father's room for refuge from sleeplessness.
He dreaded the demon of sleeplessness, which he felt had marked him for its own.
He had suffered from sleeplessness, but was not otherwise unwell.
Her face was very pale, and her eyes were red, as if from sleeplessness or weeping.
Opium should not be used unless the patient suffers from sleeplessness.