Ours follow us into the bathroom to be petted and scratched, she does the same thing at night, then sleeps BETWEEN us, in HER space! Now to answer the original question, if you want to stop this behavior, just ignore her when she jumps on the sink, eventually she will stop. If you are asking why she wants her head wet, no idea.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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