I have an Android car stereo with Waze.
When I turn on ignition, Android boots up and Waze starts.

It seems that Waze needs GPS as well as network access to detect night mode. As after bootup, GPS and network needs a while (1 or 2 minutes), Waze starts in day mode even in the night.

Please, do not addict night mode detection to GPS and network, and look at the local clock. Possibly use last known position and the current time.

With Waze's full brightness of day mode it dazzles - driving so is really dangerous.