A Long Island man returned home to find an unwanted guest: a stranger wrapped in a shower curtain snoozing on his bathroom floor, according to police.

The uninvited slumber-party visitor — who was clutching a green construction hat and wearing lopsided sunglasses — was caught mid-doze at the Manorville condo at around 8 a.m. on Sept. 1, according to police.

The homeowner, who cops haven’t named, quickly snapped a picture of the groggy-eyed Goldilocks wannabe and then walked outside to call 911, according to police.

But when he stepped away to make the call, the dozing delinquent bolted, cops said.

The resident told cops he first grew suspicious that someone might be inside his pad when he noticed mud on a wall of the partially under-construction condo complex near his unit, along with an open window at his place.

Cops now believe the suspect climbed into the building on Willow Court through the window.

On Friday, police released the picture of the nonplussed prowler sitting on the tiled white bathroom floor, sporting a mustache and a blue T-shirt.

Suffolk County Crime Stoppers is offering a reward of up to $5,000 for information on the unidentified man.

It’s not the first time a suspect has broken into a home to snooze.

Two years ago, an Anderson, California, man returned to his house after a day of work to find a naked woman sleeping peacefully in his bed, the resident told police.

The unwanted sleeping beauty, Michelle Irene Watkins, 33, allegedly took a shower, ate a sandwich and guzzled a beer in the stranger’s home before hitting the hay, according to police. She was charged with burglary and petty theft.

Additional reporting by Natalie O’Neill