寝てた

was sleeping, were sleeping

→ 寝る
寝 to sleep + て Te-form (conjunctive form) + た Past tense
verb · informal, past tense Uncommon #10,765
was sleeping, were sleeping Colloquial contraction of 寝ていた.
JA: 昨日はずっと寝てた。
EN: I was sleeping the whole time yesterday.
Conjugation of 寝る

もう寝てたよ。

I was already asleep.

ずっと寝てた?

Were you sleeping the whole time?

— パディントン2 (2017)

僕は寝てたのか?

Was I asleep?

— ファイト・クラブ (1999)

寝てたから…じゃなおさらだ行こう!

You were asleep, so… all the more reason to go!

— 魔女の宅急便 (1989)

寝てたのか?

Were you sleeping?

— 預言者 (2009)

俺、授業中に寝てたよ。

I fell asleep in class.

寝てたと言ったわ

I told you I was asleep.

— ミスティック・リバー (2003)

寝てたんだ

I was asleep.

— 甘い生活 (1960)

ガリバルディが寝てたという伝説がある

There’s a legend that Garibaldi slept there.

— ライフ・イズ・ビューティフル (1997)

まだ寝てたわよ。

You were still asleep.

ずっと寝てたのか?

Were you asleep the whole time?

— ファイト・クラブ (1999)

寝てたのか俺…

Was I asleep…?

— すずめの戸締まり (2022)

そういえば、子供の頃は押し入れで寝てたな。

Come to think of it, I used to sleep in the closet when I was a kid.

寝てた?

Were you asleep?

— 道 (1954)

寝てたからよく分からん

I was asleep, so I’m not really sure.

— REC / レック (2007)

犬は僕と一緒にベッドで寝てた。

The dog was sleeping in bed with me.

もう寝てたのね

You were already asleep.

— 戦争と女の顔 (2019)

彼はいつも仕事場で寝てた

He was always sleeping at work.

— 落下の解剖学 (2023)

今日ね、トムったら昼まで寝てたのよ。

You know, Tom slept until noon today.

寝てた方がいいですわ

You’d better be sleeping.

— サイコ (1960)

今夜キティが帰宅するとハリーは寝てた

When Kitty got home tonight, Harry was asleep.

— シカゴ (2002)