Hi, I'd like to take my DS (4 months old) to my parents for a week soon, but it is a 200 mile journey and I would be doing it on my own so I am worried about my son being on his own in a rear-facing car seat for such a long journey. I will be travelling at night when he is usually asleep but am worried because I will not be able to see him. Mirrors won't help as it will be dark and I will be on the motorway. Has anyone else driven a long journey on their own with such a young baby?