トムは寝ていた。

とむは寝ていた。

Tom was sleeping.

トムは寝(ね)ていた。

Tomu wa neteita.

富む (とむ)

to be rich; to become rich; to be abundant (with); to abound (with); to be rich (in)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

寝る (ねる)

to lie down; to go to bed; to lie in bed; to sleep (lying down); to sleep (with someone, i.e. have intercourse); to lie idle

Readings: シン、ね.る、ね.かす、い.ぬ、みたまや、や.める

Meanings: lie down, sleep, rest, bed, remain unsold