The document provides analysis of key themes in Eugene O'Neill's play Long Day's Journey into Night. It discusses several themes:
1) Addiction - All the Tyrones depend on drugs/alcohol to escape their problems, but this exacerbates rather than alleviates their issues.
2) Displacing blame - The characters obsess over the past and blame others for their problems rather than accepting responsibility.
3) Denial and self-delusion - When sober, they deny flaws and choose to argue they are victims rather than face failures.
4) Hopelessness/religion - A lost faith results in a loss of hope, especially for Edmund who awaits his death without purpose.
5) I