What is the origin of 'sleep tight'?

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

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A continuous statistical distribution of two parameters α and β of which the chi-squared and exponential distributions are special cases, given by f(x) = βα x α−1 e −βx/Γ(α), for x, α, β all positive, where Γ is the gamma function.

1930s; earliest use found in Annals of Mathematical Statistics.