A Swedish backpacker who woke to find a man choking her only learned after medical check that she had been raped in her sleep.
Ivan James Williams, 38, was today jailed 11 years for the sex attack which came after he offered his rented campervan to the woman.
The pair had earlier shared wine when the backpacker's friend, who was staying at the same hostel as Williams, had cancelled plans to go out with her.
The violent rape occurred inside the van parked in a darkened alley outside a Perth backpackers in March 2013.
Williams held a piece of glass against his victim's neck when she woke and threatened to cut her throat.
The backpacker, who had arranged to sleep in the van by herself and for Williams to sleep on the hostel couch, courageously struggled and bit her attacker before fleeing into the hostel bleeding, hysterical and half naked.
The District Court was told the horrific ordeal had continued when she underwent testing that detected her attacker's DNA inside her as a result of unprotected, nonconsensual sex.
Judge Patrick O'Neal today said Williams' crime had scarred the young woman mentally and physically, with the news that she had been unknowingly raped in her sleep prompting her to break down at the testing centre.
Williams had been on bail for alleged sex offences in South Australia at the time of the aggravated rape, though it was noted no convictions had been recorded on the pending charges.
Judge O'Neal said Williams had preyed upon a vulnerable victim who had only decided to sleep in his van thinking she was safe.
The woman had only overcome a bout of depression shortly before her trip to Australia, the court heard.
Judge O'Neal said Williams' decision plead guilty would be taken into account but noted it had happened very late - only after the woman had testified in a trial.
The judge also noted he was at high risk of re-offending.
Williams was handed 11 years for two counts of aggravated rape, attempted aggravated rape, threats to injure and assault causing bodily harm.
He can apply for parole after serving nine years.