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A study finds combat soldiers who were heavy users of energy drinks were more likely to sleep less than four hours a night. But is the popularity of the drinks contributing to sleeplessness or just a reflection of it?

The group of patients that was treated more intensively did 25 percent better than the one that was treated to the traditional target. But some side effects nearly doubled with intensive treatment.

A White House spokesman won't rule out the possibility of the president choosing sides in a presidential primary, even if it's a race between his former secretary of state and his vice president.

The Patriots quarterback said he got rid of his phone only after his lawyers told the NFL his device would "not be subjected to investigation." Brady said he was "disappointed" in the NFL's decision.

Risk of death by heart attack or suicide is greatest in the first week after getting a diagnosis, according to a study in Sweden. Researchers say more support from health care providers could reduce that risk.

A Russian franchisee had said the fast-food empire was looking to extend its rule into the disputed territory. Now, the company says stories about those comments were overdone.

A group says the Chinese government backed an attack against users of Apple's iCloud service. Experts worry attacks that target weaknesses in the transfer of data on the cloud will become more common.

Most people can't tell when they're having the irregular heartbeat called atrial fibrillation that puts them at risk of stroke. Simply learning to take your own pulse could help, researchers say.

The moderate Republican will face an important test when President Trump's impeachment trial begins in the Senate. Collins has not indicated how she plans to vote.

It was widely reported that he would fly from Moscow to Havana on Monday. But he apparently did not board that flight. Just where Snowden is headed isn't known for sure, but it's thought that his final destination will be Ecuador.