A man found unconscious under a North Sydney overpass has woken from a coma on his 21st birthday.

Shaun Dunworth, from Donegal, in Ireland, was found under the High Street overpass in North Sydney on July 29.

The iconic Sydney Harbour Bridge was shutdown following the discovery of Mr Dunsworth and it was suspected he either fell from the overpass or was a pedestrian and was hit when he attempted to cross the road.

His parents, Stevan and Karen, rushed to Australia from their home village of Ramelton in Ireland to be at his hospital bedside.

The distraught couple decorated his hospital room to mark his 21st birthday.

Shaun Dunworth, from Donegal, in Ireland, was found under the High Street overpass in North Sydney on July 29. (Google Maps)

And amazingly, he opened his eyes on the special day, with his first words sending his parents into tears.

“Mum and dad, I love you,” he said.

Since the accident, Mr Dunworth has had surgeries on his pelvis and face.

He has now been taken off life support and is out of intensive care, the Metro reports.