It is so sad many today consider a walk of about 2 tenths of a mile (1050 ft) a "very long walk".
It's about the same distance to walk to the Perko's restaurant for dinner.
I did the CZ to CS layover in Early April of 2015 when the ceiling supports were still in place.
Though there was no air conditioning they had fans going and it didn't get uncomfortable in the waiting area.
If you have sleeper accommodations on either train the day of your layover you will be able to use the sleeper passenger waiting area in the SAC station.
http://discuss.amtraktrains.com/index.php?/topic/66354-sacramento-station-renovations/
Though I'm old and decrepit, I successfully made the trek from the SAC platform to the station - and back when it was time to go out to catch the CS northbound.
I had to stop a couple of times to gather my physical resources during the trek each way, but for me that's just standard operating procedure these days and I don't think of it as me being put out.
That's no different than here at home, in that I walk
at least a mile a day, but when I walk anywhere I have to stop often to 'gather my resources'.
I don't know if the Red Caps are still around at just before midnight when the CS is scheduled to arrive/depart.
On my return trip and was making the CS to CZ connection I used the Red Cap service and got a ride out to the platform along with several other passengers.
http://www.sacbee.com/news/local/transportation/article18451520.html