Police say the incident took place at about 2:30 a.m. Tuesday in Paoli.
The woman told police she woke up to find the male suspect standing without clothing in her bedroom.
Investigators believe the intruder crawled through a window, undressed and made his way upstairs.
Police say the woman's pet Rottweiler scared off the naked man.
Tredyffrin Township police Capt. Andy Chambers says, "This is a high level of desperation that a criminal would do something like this ...."
