Do a Netflix search on Example Short 23.976 and play it on your Apple TV. You will see the bit rate in kbps and the resolution you are getting in the upper left part of the screen. You will find that the numbers are far worse in Prime Time at night than they used to be just a few weeks ago. If you have a Roku, Chromecast or another device to play Netflix you will find the numbers are much better any time of day or night.
Here is the full discussion on the Apple Support Communities.