Tammy Callejan, her four-year-old son and two-year-old daughter were staying with friend Chantelle Nilsson and her two young children in her Tyrone Street unit.

Ms Callejan said that just before 5am, minutes after her friend had got out of bed to answer the phone, she woke her up and said there was a stranger inside the house.

"She [Ms Nilsson] was shaking and had tears in her eyes.

"At first, I didn't believe her, but we got up and saw the bathroom light was off.

"Chantelle usually leaves the light on, and the door open, in case her children want to use the toilet during the night.

"We opened the bathroom and saw the man lying there naked with his hands over his genitals.

"Chantelle yelled 'Who the hell are you?' and told him to get out of the house.

"He then jumped out of the bath and stood there, and I asked whether he had been inside the house before, and he kept asking for a girl neither of us knew.

"After realising Chantelle was giving his description to police he ran out the door."

Police believe the man gained entry to the unit through the front door, which was closed but not locked.

Senior Sergeant Angelo Ferrara of Werribee police said they were called to the Tyrone Street address over the unlawful presence of a man inside a house.

They arrived to find the 28-year-old wearing only socks, underwear and a T-shirt.

"When he saw police, he panicked and ran," he said.

"He was chased [by officers] and put up some resistance, so capsicum spray was used."

The man was arrested and taken to the police station where he was charged for being drunk and disorderly. "It appears he had the wrong address," he said.

"His usual residence is not far from Tyrone Street and one of the women inside the house told police he was asking for another female, who was apparently a friend of his."

Ms Callejan claimed the man undressed and vomited in Ms Nilsson's room, before falling asleep in the bath.

"We're angry with the whole situation, because he's trespassed and invaded our privacy, but can't be charged with anything apart from being drunk."

Senior Sergeant Ferrara said the man was not charged with any other offences because it was clear there was no criminal intent on his part for entering the house.