A man is sitting on a blue bench with a blue blanket covering his face.
A man is taking a nap on a bench.
A man is sitting on a blue bench with a blue blanket covering his face doesn't imply that he taking a nap.
We have no idea the man is trying to nap, he could be sitting for a number of reasons.
A man with a blanket over himself on a bench is not necessarily taking a nap.