WASHINGTON — These Congress members are sleeping on the job — and defending their right to do it. Crying poverty amid decade-long stagnant salaries and Washington’s steep cost of living, an increasing number of House lawmakers have turned into professional squatters at night, hitting the sack in their Capitol Hill offices — on everything from cots in closets to futons stashed behind constituent couches — to save a few bucks during the work week. “Washington is too expensive,” said Rep. Dan Donovan (R-SI), who credits the cot that he sleeps on in a tiny alcove in his office as the...