A woman woke in the small hours to find a naked stranger in her bedroom.
Police are keen to trace the man, who fled after apologising and saying he was in the wrong house.
The 39-year-old woman was sleeping in her ground-floor bedroom in central Bognor when the man entered her flat early on Saturday.
She woke to find him at the bottom of her bed, without any clothes on, and confronted him.
The man was white, aged 20 to 25, 5ft 10in tall, lean, and had a tattoo on his right arm.
He is said to have had thin lips, narrow eyes and clean, light brown hair.
Police are appealing for witnesses to contact them on 0845 6070999.
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