What are some themes of the poem "On how my mother sleeps"?

Some themes developed in "On how my mother sleeps" are:

How we grow up and how growing up defines ourselves.

Explanation:

The poem describes how the mother of the authors sleep and she remembers different episodes of their life. Telling that time and life has defined them, that those elements have also influenced the way they sleep and how maturity has arrived at each one of them in their own stage making them differentiate one from the other.