Freddy's Nightmares (1988)

S1E20 The Light At the End of the Tunnel

Michael, a thirty-something man, has always had an intense fear of darkness. However, his life takes a turn when he begins a job repairing pipes in the shadowy depths of the sewers. Meanwhile, a shady video store owner finds himself trapped in a cycle of nightmares, forced to experience his worst fears repeatedly without any chance of escape.