It’s a truism that Eugene O’Neill’s Long Day’s Journey Into Night is long and repetitious, so it comes as a surprise that Richard Eyre’s production plays so grippingly that it's never a slog. Eyre makes it clear that the Tyrones, the family at its center (based O’Neill’s own), are deeply dysfunctional, but each repetition at the BAM Harvey Theater rings true, and many of them prove comical. Each character knows the others’ strengths and frailties. Yet although they claw at one another often, there’s pulsing love in this family.