Pulling an all-nighter is basically a prerequisite for running 100 miles. For Emily Coggin, however, clocking in for the graveyard shift — to save lives or start another training session — is just a normal Tuesday. “I work nights in the Vail Health Emergency Department,” the Vail ultrarunner said. “So that creates a new layer for training after being awake for a whole night.” Coggin is one of 14 Eagle County runners who will toe the line at 4 a.…