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寝たら

if (someone) sleeps, when (someone) sleeps

→ 寝る
寝 sleep, go to bed + た Past tense + ら Conditional
verb · conditional Rare #27,352
if (someone) sleeps, when (someone) sleeps Conditional form of 寝る; the subject is determined by context.
JA: 寝たら、元気になりますよ。
EN: If you sleep, you'll feel better.
Conjugation of 寝る
Conditional
寝たら寝れば寝なければ

窓開けたまま寝たら駄目だよ。

You shouldn't sleep with the window open.

寝たら？

Why don't you go to sleep?

眠いけど今寝たら明日のテストがやばい。

I'm sleepy, but if I go to sleep now, I'll be screwed for tomorrow's test.

ベッドで寝たら?

Why don't you sleep in bed?

— マルホランド・ドライブ (2001)

いい加減に寝たら。

Why don't you go to bed already?

明日早いんだからもう寝たら？

You have to get up early tomorrow, so why don’t you go to bed?

あんな美人と寝たら即死だぜ

If I slept with a beauty like that, I'd die on the spot.

— アバウト・タイム ～愛おしい時間について～ (2013)