そろそろ寝る時刻だ。

そろそろ寝る時刻だ。

It's almost time to go to bed.

そろそろ寝(ね)る時刻(じこく)だ。

Sorosoro neru jikoku da.

そろそろ (そろそろ、そろっと)

slowly; quietly; steadily; gradually; gingerly; soon; momentarily; before long; any time now

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

時刻 (じこく)

instant; time; moment

だ (だ)

be; is; indicates past or completed action; indicates light imperative

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

Readings: ジ、とき、 -どき

Meanings: time, hour

Readings: コク、きざ.む、きざ.み

Meanings: engrave, cut fine, chop, hash, mince, time, carving