Our expert says:
There can actually be many different cuses for night sweats ( especially like now when the weather has remained rather cold in general ). And this is usually a physical / medical cause, often related to a range of possible infections. See a good general physician for a thorough check-up first, to check on the range of potential physical causes.
The pattern of the sweating can be relevant ; such as the pattern you describe of 2-3 nights in a row but only every few months. Other such details help to point out the likely cause, and thence the likely best response to it.
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