Police later found a red-faced neighbour who was so drunk that he went into the house because he thought it was his own.
"He was very apologetic," Superintendent Daniel Shean said.
The man got lost on the way to his house in Katherine on Wednesday night. He walked into the home and took a shower in an attempt to sober up.
The 34-year-old householder was asleep upstairs.
She woke up, heard the water running and frantically rang the police.
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