What is the origin of 'sleep tight'?
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Definition of Sakhalin in US English:
Sakhalin
proper noun
A large Russian island in the Sea of Okhotsk, situated off the coast of eastern Russia and separated from it by the Tartar Strait; capital, Yuzhno-Sakhalinsk. From 1905 to 1946, it was divided into the northern part, held by Russia, and the southern part, occupied by Japan.
