Nansubuga was born in the United States to Ugandan parents and works in international development in East and Southern Africa. Her debut picture book 'Sleep Well, Siba and Saba' was voted a Kirkus Best Picture Book of the Year.

Forgetful sisters Siba and Saba are always losing something. Sandals, slippers, sweaters - you name it, they lose it. When the two sisters fall asleep each night, they dream about the things they have lost that day. Until, one night, their dreams begin to reveal something entirely unexpected...