King Mahāsudassana 2.13.2

2.13.2

Seyyathāpi, ānanda, gahapatissa vā gahapatiputtassa vā manuññaṃ bhojanaṃ bhuttāvissa bhattasammado hoti; evameva kho, ānanda, rañño mahāsudassanassa māraṇantikā vedanā ahosi.

And the feeling he had close to death was like a householder or their child falling asleep after eating a satisfying meal.