Yeah I was told that. I read somewhere that it's best not to drive in the first couple of days until it settles down. Is that worthwhile?
I think you need to play it by ear. Everybody reacts differently - you may be ok to drive, you may not. You need to judge for yourself if you're feeling too drowsy to drive (or ask someone close to you how they think you're feeling)
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.