Internal Time: The Science of Chronotypes, Social Jet Lag, and Why You're So Tired
The disconnect between our internal, biological time and social time — defined by our work schedules and social engagements — leads to what Roenneberg calls social jet lag, a kind of chronic exhaustion resembling the symptoms of jet lag and comparable to having to work for a company a few time zones to the east of your home.
(Via brain pickings)
