The 29-year-old autistic man whose disappearance spurred an all-night police search only to be found the next day sleeping on a golf course had a "big adventure," police said.

Gyafi Payne was found Sunday morning sleeping in the back of a golf cart, about three kilometers from where he disappeared Saturday evening at about 7:30 p.m.

"He's had a good walk. He's on a big adventure. He's very excited. He's in good health. We're really happy about that," Sgt. Phil Glavin said.

On Saturday, Payne and his father had gone swimming in the Old Finch Ave. and Rouge River Dr. area together, something they had done often during the summer months.

Payne, who is non-verbal and functions at the level of a five-year-old, became excited and ran off.

"He was very excited last night at the thought of going swimming. So once he got in the water, the emotion took the best of him and he sort of ran off," Glavin said.

His father immediately contacted police and about 20 minutes later, a search command post was set up intersection of Sewells Road and Old Finch Avenue.

Over 25 officers on foot and several units, including K9, combed the Rouge shoreline and heavy brush area taking part in a level-three search, the highest level for Toronto Police Service.

"We've taken two officers from each division," police said at the time.

And when darkness hampered the search, a Durham Police helicopter lit up the night sky as thermal imaging equipment was used on the ground.

Payne's family members were worried for his safety and were concerned that if he approached a stranger, they would mistake him as somebody dangerous.

"So he's like a three or six-year-old, if they find themselves naked, they're happy to be naked," Glavin said.

With a report from CTV's Colin D'Mello