What is the origin of 'sleep tight'?

Read moreOne of the mysteries of the English language finally explained.

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1mass noun The action of mathematical calculation.

*‘methods of computation’*count noun*‘statistical computations’*-
*‘This alleviates the expensive computation of exponential functions involved in the distributions.’* -
*‘The text recognizes the essential role that computation plays in both mathematics and biology.’* -
*‘He has a natural aptitude for computation and is very quick at figure work.’* -
*‘He considered computation with irrational numbers and polynomials to be part of algebra.’* -
*‘It was there that he developed the proof which states that automatic computation cannot solve all mathematical problems.’* -
*‘The method was applied to find the orbit of Swift's comet of 1880 and involved less computation than Gauss's method.’* -
*‘The new system has the virtue of a lowered rate of tax, a simple method of computation, and an equitable spread.’* -
*‘What is the difference between mathematics and computation?’* -
*‘Modern proof theory, and likewise the modern theory of machine computation, hinge on the concept of the recursive function.’* -
*‘In fact Bowditch loved to carry out complex mathematical computations and the task of checking and correcting Moore's work was one he greatly enjoyed.’* -
*‘He obtained the highest level in the civil-service examination having been educated in astronomy and calendar computation.’* -
*‘I devote a lot of my time to thinking about the relationship between mathematics and computation.’* -
*‘Continuity is the mathematics of calculus and physics but there's never been a theory of computation that deals with this continuum.’* -
*‘A short article cannot possibly describe the many fascinating aspects of quantum computation.’* -
*‘I checked every computation, retraced every step, and reinvented every wheel.’* -
*‘If we can have exact numerical computation, why would anyone choose approximate arithmetic?’* -
*‘He also wrote Golasara which is written in fifty-six Sanskrit verses and shows how mathematical computations are used to calculate astronomical data.’* -
*‘The computation of logarithms had made him aware of the inaccuracy of human calculation around 1812.’* -
*‘The theory of computation appears in the most unexpected places.’* -
*‘One example of such emergent, distributed computation is the density classification task.’*

View synonyms**arithmetical problem**, problem, calculation, reckoning, tally, question-
2The use of computers, especially as a subject of research or study.

Late Middle English: from Latin computatio(n-), from the verb computare (see compute).