מלכים ב ד:לד פירוש: רש״י וMetzudat David

And he spread himself upon him. [Targum] Yonoson rendered ‘וְאַלְהֵי עֲלוֹהִי’, an expression of weariness.²⁶I.e., “he laid exhausted upon him.” There is a similar word in the Beraisa of Ha’azinu and in Sifrei. But Menachem rendered ‘וַיִּגְהַר’, an interpretation of the word according to its context, “he prostrated himself upon him.”²⁷See I Melochim 18:42.

on the bed

it was the influence of his vital organs invigorating the vital organs of the lad