Hi - just as the title suggests - we're going to drive down to Cornwall in a couple of weeks and I think we're going to drive down overnight with a 4yo and an 18 month old (who still has never slept through!). I'm hoping DS2 might do better in a moving car but can't base this on anything so I'm nervous about him screaming and waking DS1 up too. Any tips for survival? DH and I plan to share the driving if that helps. Also route planner says 6 hours, so do we keep them up late before we set off? Help!! 