But a new study in the journal Science finds that interfering with a hormone in mammalian brains called vasopressin could be the key to quickly resetting our internal clock without having to suffer through jet lag.

Vasopressin's better-known function is to control the body's fluid balance by regulating how much water we excrete in our urine. But it turns out that it's also the currency for communication between cells in a certain part of the brain called the suprachiasmatic nucleus (SCN).

The SCN is the "master clock" in our bodies, regulating our daily rhythms, said study co-author Hitoshi Okamura, who specializes in mammalian circadian systems at Kyoto University in Japan. He likens the SCN to the conductor of an