What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
A Roman defensive wall across northern England, stretching from the Solway Firth in the west to the mouth of the Tyne River in the east (about 74 miles; 120 km). It was begun in AD 122, after the emperor Hadrian's visit, to defend the province of Britain against invasions by tribes from the north.