What autobiographical elements can be found in O'Neil's play, Long Day’s Journey into Night?

The "haunted Tyrones" are dramatic portraits of O'Neill's real family, and the events of the play reflect a critical time in his life when he was about to enter a sanatorium with a mild case of tuberculosis. Like James Tyrone, O'Neill's father, James O'Neill, had been a highly successful actor, famous in the role of Edmund Daates in a stage adaptation of Alexandre Dumas's Count of Monte Cristo. Like Mary, O'Neill's mother, Ella Quinlan, became addicted to morphine under circumstances that may have been like those described in the play. And, like Jamie, O'NeilPs older brother was an alcoholic and struggling actor who literally drank himself to death after Ella O'Neill died of cancer. Many of the play's details are also rooted in fact, including the New London setting and the Tyrone family history.