Many doctors are still reluctant to prescribe sleeping pills, which are considered potentially habit-forming and, for many users, cause next-day hangovers.

FORBES: Who's making big bucks off your insomnia?

Many of life's pleasures, unfortunately, are both unhealthy and habit-forming, but people do have a choice about whether to take them up in the first place.

ECONOMIST: Blowing smoke

Next in Terlings Park's pipeline is an antianxiety drug that may have the benefits of Valium without the accompanying drowsiness, temporary memory loss and habit-forming effects.

FORBES: Betting on the brain