The euphemism "sleeping" here represents dying. Alternate translation: "Omri died as his ancestors had" or "Like his ancestors, Omri died" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-euphemism]])
The phrase "in his place" is a metaphor meaning "instead of him." Alternate translation: "became king instead of Omri" (See: [[rc://en/ta/man/translate/figs-metaphor]])