Poor sleep tied to heat fatigue, but naps may help

Sleeping only a few hours at night may increase the risk for physical and mental strain when working in the heat, but a nap after lunch may help in some respects, suggests a small study from Japan.

Lead author Ken Tokizawa and his research team at the National Institute of Occupational Safety and Health in Kawasaki wanted to examine the effect of sleep loss in work situations such as construction sites.