What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1Headed by a female; specifically (in later use) designating a family or household in which a woman is the head or sole provider.
2That has the head of a female; having a head or mind like a female.
Mid 17th century; earliest use found in John Sergeant (1623–1707), Roman Catholic controversialist and philosopher.