Why does my child get growing pains in the evenings and at bed time only, but not early in the day?

Exertional injury. A night of rest & relaxation softens the discomfort & relaxes muscles from a busy day in most children with growing pains. In fact, that pattern helps us distinguish it from more worrisome issues that often wake a kid from sleep or start as the day starts. Kids don't stretch out like athaletes to prepair their muscles for a workout. They go & go until tired & pay the price with overuse pains.