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[![enter image description
here](https://i.stack.imgur.com/0qirk.jpg)](https://i.stack.imgur.com/0qirk.jpg)
Source: [page 32, Ch.82 of よつばと！](http://raw.senmanga.com/Yotsubato!/82/32)

My translation of the highlighted text bubble is,

> Now, sleep quietly okay.

But I am confused as to why 寝てろ is used here as opposed to 寝ろ? Is it because
sleep is a resultant state (something like 知っています or けっこんしています)?

After some probing I came across
[this](https://japanese.stackexchange.com/questions/14804/how-to-
translate-%e3%81%a6-form-%e3%82%8d) but it doesn't answer the difference
between usage of 〜てろ and 〜ろ form.

What I did come to know is, 寝てろ is a compact form of 寝ていろ which is
imperative/command form of 寝ている. All in all, 寝ていろ is something like a command
to sleep (or be in state of sleep or keep sleeping?) Why is the progressive
form used here? What kind of subtlety does it add?
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question
grammar verbs manga aspect imperatives
Usage and meaning : 寝ろ vs 寝てろ?
> All in all, 寝ていろ is something like a command to sleep (or be in state of
> sleep or keep sleeping ?).

Correct. The difference in nuance from 寝ろ is " _keep_ sleeping." It implies
that she should keep staying in the bed/sleeping bag and sleeping, and won't
wake up and make any fuss.
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answer
This type of いる is called [a subsidiary
verb](https://japanese.stackexchange.com/q/18952/5010), and what it means
roughly depends on the context and the verb type. For details, see: [When is
Vている the continuation of action and when is it the continuation of
state?](https://japanese.stackexchange.com/q/3122/5010)

寝る is an ordinary action verb like 食べる, 走る or 勉強する. It's not an "instant
state-change (aka punctual)" verb like 知る, 結婚する or 倒れる. This means when 寝て
(the te-form of 寝る) is followed by いろ (the imperative form of いる), it usually
means the **continuation** of the action (i.e., "be ～ing"). So 寝ていろ means "Be
sleeping" or "Keep sleeping", while 寝ろ just means "Sleep." or "Go to bed."
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answer