A sleep doctor's cognitive shuffling technique can stop 3 a.m. anxiety and get you back to sleep in seconds — no pills, gadgets, or prescriptions needed.

Waking up at 3 a.m. destroys your focus. This simple mental trick forces your brain offline instantly.

The goal in the world of global health is to bring an end to this scourge by 2030. A new drug looks as if it could do the job ...