What do you mean by a lazy man's lair and a bed covered with clothes?

Lazy people lie at home with their clothes on.

The phrase "the lazy man lies in his nest and wears clothes" means that the lazy man lies at home and sleeps with clothes on. This is a mockery of lazy people, describing their habit of not moving and always lying down and not sitting. This sentence can be used to describe the living conditions of those who are lazy and inactive.