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.    It is possible that dro oling or excess salivation flowing out of mouth onto the pillow and b ed sheet happens.  The reason could be that the person sleeps onto one side, with mouth open and a bit in a sl anting position.

   It is possible that those who sno re and those who have some breathing problems with nose, d rool.  Those breathing through mouth during sleep could dro ol.

   There could be other conditions like some mental disability.

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