Many American teenagers try to put in a full day of school, homework, after school activities, sports and college prep on too little sleep. As evidence grows that chronic sleep deprivation puts teens at risk for physical and mental health problems, there is increasing pressure on school districts around the country to consider a later start time.

As a criminal justice reporter for the Houston Chronicle, Keri Blakinger has a special interest in covering the conditions of prisoners — in part because she spent nearly two years locked up in county and state correctional facilities herself.

Blakinger, who grew up in Lancaster, Pa., was a competitive figure skater, but when her skating partner left her when she was 17, things began to unravel.

"I couldn't imagine a world other than skating," she says. "And I fell apart and I started using drugs."

The United Kingdom is embroiled in its biggest political crisis in decades. On Wednesday evening, members of Parliament in Prime Minister Theresa May's own Conservative Party are casting ballots in a no-confidence vote over her leadership. May needs to win a simple majority of votes from her party's parliamentarians to keep her job.

Here's what you need to know.

Why do members of the prime minister's own party want to sack her?

Updated at 2:51 p.m. ET

A federal judge sentenced Donald Trump's former lawyer Michael Cohen to three years in prison on Wednesday following Cohen's guilty pleas to a number of political and finance crimes.

Those three years would be followed by three years of supervised release, and Cohen also is subject to forfeiture of $500,000, restitution of $1.4 million and a $50,000 fine.

Cohen had asked for leniency. He said in court, however, that he accepts responsibility for his actions.

Before the sun rose Wednesday over Tennessee, some residents in the eastern half of the state got a wake-up call. But it wasn't a friend or partner shaking them awake, it was the very ground beneath their beds.

A magnitude 4.4 earthquake struck at around 4:14 a.m. ET near Decatur, Tenn., about 150 miles southeast of Nashville. But Tennessee residents weren't the only ones to feel the temblor. More than 7,700 people (so far) have reported experiencing it, from Kentucky and northern Alabama to the western Carolinas. The earthquake made its presence felt even in Atlanta.

The video footage is surreal, a pair of gloved spacesuit hands wielding what looks like a silver dagger, poised to stab the outside of a Russian spacecraft.

"Honestly I can't look at that," cosmonaut Sergey Prokopyev says, as voiced by a translator, while fellow cosmonaut Oleg Kononenko slices into the side of the Soyuz MS-09 capsule. "It's my vehicle, Oleg!"

It was all part of an attempt Tuesday to solve the mystery of the leaking International Space Station.

Dr. Jonathan Sevransky was intrigued when he heard that a well-known physician in Virginia had reported remarkable results from a simple treatment for sepsis. Could the leading cause of death in hospitals really be treated with intravenous vitamin C, the vitamin thiamine and doses of steroids?

Updated at 10:45 a.m. ET

A manhunt is underway in France for a known criminal suspected of opening fire on a Christmas market in Strasbourg on Tuesday evening, killing two people and injuring more than a dozen others.

Authorities in Germany also are on high alert in case the suspect crossed the border. Hundreds of law enforcement officers are participating in the search, Jake Cigainero reports for NPR from Paris.

Leaders from nearly 200 countries, including the United States, are at a big climate conference in Poland this week. They are struggling to agree on rules for how to meet their national promises to reduce greenhouse gas emissions under the Paris climate agreement of 2015. The official U.S. position is making it difficult.

Updated at 3:03 p.m. ET

U.K. Prime Minister Theresa May is fighting to keep her job as members of her Conservative Party seek to oust her in a no-confidence vote Wednesday. May has been unable to shore up support for the draft Brexit deal she negotiated with the European Union.