A
Personally from what I have seen/heard of the case he probably got the right sort of sentence, his driving was well below the standard reasonable expected in the circumstances (rain), he put the lives of other at risk (his son, a minor which probably makes it worse).
I can't agree about the sentence. He was certainly irresponsible and put himself and others at some risk, but there was no accident and no one was injured or killed. Do you honestly believe that riding a bike at 122mph deserves a 6 month sentence, yet falling asleep at the wheel and killing a pensioner does not? How about only 10 months for falling asleep and killing a man and injuring his wife?
Driving whilst you are very sleepy is a voluntary decision, just as speeding is yet the chances of a bad outcome are certainly higher, so why the vast difference in sentencing?