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if that did not happen to you before (it usually happens now and then, when somebody has no partner... Sexuality tries to find it's way), it might be a sign of hormonal disbalance. A certain lack of estrogen may cause the gestagenes (which support sexual desire) to predominate.
Another reason may be a vainal infection. Itching, which often appears stronger during nighttime, may irritate your genital tract and cause arousal.
So please see your gynaecologist; don't be shy, he/she is used to these questions.
One more thing: People developing Parkinson's disease experience these sensations sometimes before the other symptoms appear. If your GYN doesn't find anything unusual, you should be referred to the neurologist.
I wish you all the best! Please feel free to ask if anything is not clear yet.
You have read my answer. What do you think?