High arousal emotions include excitement on the positive side or anger on the negative side; while low arousal ones include feeling calm on the positive side or lonely on the negative.
Even when everything seems like it's going up in flames, Scaloni will be there on the touchline with a pensive but calm look on his face, thinking up a way out.
In both writing and sleeping, we learn to be physically still at the same time we are encouraging our minds to unlock from the humdrum rational thinking of our daytime lives.