A taxi driver who claimed he kicked his parents to death while sleepwalking has been found guilty of murder.
Vernon Silich was angry and drunk when he attacked his parents wearing steel-capped boots, a jury in Australia was told.
The 44-year-old from Perth later called a friend and said: "I don't know what I've done, I just went berserk. I went mad."
Prosecutors argued that Silich became angry with his 65-year-old parents over the death of his brother Murray from a drug overdose some weeks earlier in early 2008.
But Silich's lawyer, Tom Percy, said the deaths of retired policeman Robert and his wife Faye were motiveless and bewildering.
He insisted his client enjoyed a loving relationship with his parents and said there was no animosity.
The murder was "out of character" and even if the jury did not believe he was sleepwalking, Silich might also have been "massively affected by alcohol" and had no intention to kill them.
Silich said he had no recollection of the event after a night of heavy drinking and woke early in the morning to find his parents' bodies in their bedroom.
He faces life in prison when he is sentenced on April 16.