寝てない

not sleeping

→ 寝る
sleep, go to bed + Te-form (conjunctive) + ない Negative
verb · indicative Uncommon #17,396
not sleeping Informal contraction of 寝ていない.
JA: 昨夜からずっと寝てない。
EN: I haven't slept since last night.
Conjugation of 寝る
Indicative
寝ます寝てない

母さんは昨夜寝てない

Mom didn't sleep last night.

— ウィッチ (2016)

寝てないですね

You haven't been sleeping, have you?

— ロード・オブ・ザ・リング/王の帰還 (2003)

その寝てない

That dog isn't sleeping, you know.

彼はどうして寝てない

Why isn't he sleeping?

彼女はどうして寝てない

Why isn't she sleeping?

その寝てない

That cat isn’t sleeping, you know.

何でまだ寝てないのかな

I wonder why they’re still awake.

何日も寝てないんです

I haven't slept for days.

あなた寝てないのね

You haven't slept, have you?

— レベッカ (1940)

まだ寝てない

You're still awake?

寝るの寝てない

I haven't been sleeping at night.

— 最強のふたり (2011)

ここ数日寝てないんだ

I haven't slept in the past few days.

最近、彼とは寝てない

I haven't slept with him lately.