Washington (CNN) - After a long day on Capitol Hill, Illinois Republican Rep. Joe Walsh checks into what's become the cheapest hotel in Washington – his own office.
His sofa is not exactly a king size bed. "I gotta be honest. It's horrible. The couch is very uncomfortable," Walsh said. "I've rolled off to a thud," added Walsh, an active sleeper.
But crashing on his couch saves his family the expense of finding a second home in the nation's capital, one of the most expensive real estate markets in the country.
One liberal government watchdog group, Citizens for Responsibility and Ethics in Washington (CREW) says the roughly three dozen congressmen (no women so far) who are sleeping in their offices have turned the House into a "frat house."
In a letter seeking an investigation by the Office of Congressional Ethics, CREW accuses the lawmakers of milking a "fringe benefit on which members of Congress must pay taxes."
But this is nothing new. Utah Republican Rep. Jason Chaffetz showed off his office cot to CNN two years ago, saying it saved his family an estimated $1,500 dollars a month in rent he didn't spend on a D.C. apartment.
Democrats are doing it too. Freshman Michigan Rep. Hansen Clarke hopes to set an example of thriftiness to his constituents. But it comes at a cost.
"I haven't had a good night's sleep since I've been in Congress," Hansen said. "I'm here to work, not be comfortable."
Walsh, also a freshman House member, welcomes any investigation.
"If this is free housing that I have to pay a tax for, I'll pay it," Walsh said.
The Tea Party-backed Republican made headlines before he was even sworn-in when he refused to sign up for his government medical plan, a symbolic protest against the President's health care law.
Walsh denies there is a contradiction in refusing Congressional health care while accepting free housing in his taxpayer-provided office, all on a salary of $174,000 a year.
With all of the major issues facing lawmakers, Walsh is stunned anybody cares where he sleeps. "It's damn silly," he said.