My son slipped on ice last week and hit the back of his head. Clearly a concussion. We knew what to do from another son's concussion in a car accident several years ago. If there aren't complications, the best thing to do is let the brain rest - stay as quiet as possible . So, darkened room - no reading, screens, etc. and quiet - no music, books on tape, ect. The doctor actually said, "don't think" - at least as much as possible. She acknowledged it isn't really possible.
The car accident was more severe - he was stopped when a car hit his car going 70 mph, it broke the drive train of his car. He couldn't tolerate much light or much sound for many days.
Maybe the dr told him to start doing things as he could tolerate them - I don't remember that part. This time, I thankfully read this book only a couple of days after the injury, so it didn't really matter but it is much less worrisome to know he should be doing what he can without exasperating symptoms.
I was quite worried yesterday when 6 min of work was all he could do. Today, he can do about a half hour at a time (he also turned the screen brightness down, is doing some of it verbally, and such), I am much less worried now.
Yes, concussions are being taken much more seriously by medical people in general as well as in sports and so on. It is really, really good that they are.