Do the following sentences differ in meaning? I understand that conditional たら
adds the meaning of simultaneous action, but does the meaning of the sentence
really change without たら?

> 寝ようとした、電話が掛かってきた。I was about to go to bed, and the phone rang.
>
> 寝ようとした **ら** 、電話が掛かってきた。 **When** I was about to go to bed, and the phone
> rang.
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2017-05-02T02:39:44.477
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2018-07-24T05:03:59.097
2020-06-17T08:18:27.500
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question
conditionals
What does conditional たら add to 未然形+う+とする?