Matthew Poole and continuators on 1 Kings 3:20

20 And she arose at midnight , and took my son from beside me , while thine handmaid slept , and laid it in her bosome, and laid her dead child in my bosome.

When I was asleep, as she reasonably and truly concluded.

Either, because the really desired the comfort of a Child, to be educated by her, and owned as hers: or, because she would not be thought guilty of the Childs death, for which she knew not how severely Solomon would punish her.

As the might well know, because had she been awake, she had discovered and prevented her design.