Nevada U.S. Senate Democratic candidate, Catherine Cortez Masto, wears a sticker after voting at an early voting site in a Cardenas supermarket in Las Vegas, Wednesday, Nov. 2, 2016. Steve Marcus AP
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That could be the key to how much sleep Americans get on Tuesday night.

Does the election come down to a single close state — like Florida in 2000 or Ohio in 2004 — or does one candidate win a majority of electoral votes even as one or more states continue to count their votes?

If it is the latter, Clinton or Trump could deliver their victory speeches in time for most people to get a decent night’s rest.

When do the polls close?

Polls open as early as 6 a.m. (all times Eastern) in some states.

Polls close in Georgia, Indiana, Kentucky, South Carolina, Vermont and Virginia at 7 p.m.

Polls close in North Carolina, Ohio and West Virginia at 7:30 p.m.

Polls close in Alabama, Connecticut, Delaware, the District of Columbia, Florida, Illinois, Maine, Maryland, Massachusetts, Mississippi, Missouri, New Hampshire, New Jersey, Oklahoma, Pennsylvania, Rhode Island and Tennessee at 8 p.m.

Polls close in Arkansas at 8:30 p.m.

Polls close in Arizona, Colorado, Kansas, Louisiana, Michigan, Minnesota, Nebraska, New Mexico, New York, South Dakota, Texas, Wisconsin and Wyoming at 9 p.m.

Polls close in Iowa, Montana, Nevada and Utah at 10 p.m.

Polls close in California, Hawaii, Idaho, North Dakota, Oregon and Washington at 11 p.m.

Polls close in Alaska at 1 a.m.