WASHINGTON — The federal government ran out of funding at midnight, but you may not have noticed.

In fact, it could be several days before the full impact of the shutdown is fully felt by the public.

Government agencies began the process of shutting down at midnight Friday after Congress failed to pass a spending bill to keep them operating. But not every government employee was sent home.

More from USA Today:

No immediate resolution to spending impasse after Trump, Schumer met on shutdown

House passes short-term spending bill, but legislation faces long odds in Senate

Pentagon readies to shutter offices, troops to keep fighting without pay

Federal workers deemed "essential" are still on the job, and key government functions — such as national security operations and law enforcement work — remain up and running.

Other agencies have residual funds that will keep them operating for several days. But if the shutdown drags on, they, too, could run out of money and have to close their doors.

Here's a look at what you can expect during the Government Shutdown of 2018: