Night shift work is not for the weak. Staying awake from dusk through to dawn, as many nurses, doctors, and emergency responders do, seems to take a toll on the body and mind . But does it have an impact on the brain? Neuroscientists in Singapore have now found evidence that shift work is tied to brain volume losses in key parts of the brain. If shift work is stopped, however, those reductions are partially recovered within two and a half years, on average. What those losses and gains actually