私は夜遅く寝ました。

私は夜遅く寝ました。

I went to bed late at night.

私(わたし)は夜(よる)遅(おそ)く寝(ね)ました。

Watashi wa yoru osoku nemashita.

私 (わたし、わたくし)

I; me; private affairs; personal matter; secrecy; selfishness

は (は)

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

夜 (よる、よ)

evening; night

遅い (おそい)

slow; late (e.g. "late at night"); too late; dull; stupid

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、わたくし、わたし

Meanings: private, I, me

Readings: ヤ、よ、よる

Meanings: night, evening

Readings: チ、おく.れる、おく.らす、おそ.い

Meanings: slow, late, back, later

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