What is the main conflict in 'Night, Mother by Marsha Norman?

Consider the play's unflinching depiction of a family specifically a mother and daughter in crisis. This lack of sentimentality and the play's focus on the loneliness and emptiness of the two women's lives are often cited by those praising 'night, Mother. In contrast, those who did not like the play most often complain that it is drab and lacks any significant development in its two characters.