Dozens of House Democrats are calling for an ethics investigation into the habit many lawmakers seem to have of sleeping in their congressional office, something that critics say is improper and unsanitary.

In a December letter signed by 30 members of the Congressional Black Caucus (CBC) obtained by Politico, the Democrats called for a probe into whether the "problematic" practice violated federal law.

"Members who sleep overnight in their offices receive free lodging, free cable, free security, free cleaning services, and utilizie other utilities free of charge in direct violation of the ethics rules which prohibit official resources from being used for personal purposes," the members wrote in a letter to House Ethics Committee Chairwoman Susan Brooks Susan Wiant BrooksHouse Democrats' campaign arm reserves .6M in ads in competitive districts Stefanik credits Trump for spike in GOP women running for office DCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program MORE (R-Ind.) and ranking member Ted Deutch Theodore (Ted) Eliot DeutchShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Florida Democrat introduces bill to recognize Puerto Rico statehood referendum Matt Gaetz, Roger Stone back far-right activist Laura Loomer in congressional bid MORE (D-Fla.)

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The Ethics Committee has yet to respond to the letter, signed by CBC Chairman Cedric Richmond Cedric Levon RichmondRep. Cedric Richmond set to join House Ways and Means Committee Biden campaign ratchets up courting of Black voters, specifically Black men Buttigieg, former officials added to Biden's transition team MORE (D-La.) and other top Democrats, even though it requested a response by Jan. 5. CBC members are reportedly preparing to send another letter, making it the third official call for action on the issue.

The Democrats recommend in the letter that if the Ethics Committee allows lawmakers to sleep in their offices that the members be taxed "at the fair market value of a Capitol Hill apartment" to disincentivize the practice.

Some members said they took issue with a number Republicans regularly sleeping in their congressional offices, living for free in a government building, while advocating cuts to welfare programs.

The Washington, D.C., metropolitan area has one of the most expensive housing markets in the country.