Waikato police say no charges are being laid after a young man woke early today to find a 40-year-old naked woman in his bed trying to take his clothes off.

A spokesman said the man had been drinking at his Melville neighbour's house before heading home to bed.

"The man has been asleep and unaware of what was going on, with the 40-year-old intoxicated woman in his bed. His mother has heard a noise and went to have a look and found the woman, naked, trying to remove the victim's clothes."

The man's mother called police but no charges are being laid.