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寝たら

why don't you go to sleep?, if you sleep, when you sleep

→ 寝る
寝 to sleep + た Past tense + ら Conditional (if/when)
verb · informal Rare #36,066
why don't you go to sleep? When used as a question, this form can make a suggestion.
JA: もう寝たら？
EN: Why don't you go to bed now?
if you sleep, when you sleep
JA: 遅く寝たら、朝起きられない。
EN: If I go to bed late, I can't get up in the morning.
Conjugation of 寝る
Conditional
寝なければ寝たら寝れば

窓開けたまま寝たら駄目だよ。

You shouldn't sleep with the window open.

いい加減に寝たら。

Why don't you go to bed already?

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)

寝たら？

Why don't you go to sleep?