Shanahan noted that although he and his coaches did spend some time on self-scouting and other work during the bye week.
A little time apart was good for us emotionally and physically, Shanahan added.
"The most important thing to remember is that when you return from your bye week.
This is in stark contrast to how you probably felt the day before your bye week.
Midway through a long and difficult NFL season, the Niners, like every other team, are still missing some crucial players.
In particular, defensive lineman Arik Armstead has been out since September due to foot and ankle issues.