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Would using a kindle at night have the same effect? It's light is kind of yellowish (I think)

Probably less so because it's reflected off the e-ink screen surface and probably diffused a bit that way.

Right. Also the illumination is at the bottom of the screen and hence indirect, whihc might reduce it further.

My first gen Paperwhite is most definitely blue, it's obvious at low brightness. Don't know about later models.