When = at which time?

Sitifan · February 25, 2019, 4:37pm

The sun rose at 5:30, at which time most people were still in their dreams.
The sun rose at 5:30, when most people were still in their dreams.
Are the above sentences acceptable?

Luschen · February 25, 2019, 7:51pm

Yes, I think they are both acceptable.

Sitifan · February 25, 2019, 9:28pm

Is the sentence below also acceptable?
3. The sun rose at 5:30, at which most people were still in their dreams.

Luschen · February 25, 2019, 9:42pm

No, that version is not correct, but this one would be:

The sun rose at 5:30, a time at which most people were still in their dreams.