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It has been known for decades that prolonged wakefulness often quickly relieves depression, writes Dr. David Hellerstein.

“Eating a poor diet, inadequate physical activity and being overweight can also contribute toward disturbed sleep,” Dr. James Gangwisch said.

The brain’s number-one desire is a constant supply of energy. Sugars and sweet foods—even no-calorie sweeteners—trigger insulin, writes Dr. Drew Ramsey.

Dr. Robert Klitzman lost his sister on 9/11. The world has moved on in many ways since the attack, Klitzman said, but it should continue to be remembered.