Now that we're nearly 20 years into the smartphone era, most of us have heard this basic tip for getting better sleep: set your phone down well before going to bed. The theory is that the blue light ...

The changes, which are subject to regulatory approval, would extend Arca electronic exchange hours from 1:30 a.m. ET to 11:30 p.m. ET Monday through Friday, or 22 hours a day, 5 days a week.