In all fairness, you've made the decision to avoid flying to Sweden as your wife is 7 months into her pregnancy and as a father of three I can fully understand that. Best wishes to the two of you by the way. However, you and I both know that the vast majority of people making that journey would choose to fly on the basis of both speed and cost.
I know we wouldn't always do this, but my point is that at any given time there are likely to be many other people that have similar needs - or simply don't like flying. Does everyone now feel comfortable in a plane? I know people who are too scared to fly, and I'm sure everyone does.
I have no doubt that while we'll fly most of the time, going the slow 'scenic' route will happen again. I've driven to Sweden many times (2-3 days, with stop overs and a day to enjoy the German autobahns!) and we used to sail and drive (if it wasn't Winter, we'd have taken the car on the boat instead of using the train) when I was younger.
It becomes part of a holiday, where flying rarely does - it's just a hassle with security, check-in, waiting around and so on. Mind you, given how amazing the new Gatwick (south) terminals is - security takes about 90 seconds to clear! I then realised that being held in security actually killed some time that is now spent airside with nothing to do but shop or eat.
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A 1- or 2-berth sleeper is a hugely different experience to a 4- or 6-berth couchette. And I really don't recognise the notion of being "chucked around" either, certainly not on the domestic sleepers I've used in the UK.
Plus, I'm sure it's lovely to be he kind of person who can go to bed early and fall asleep - personally, if I do, I usually lie awake until the time I normally go to sleep!
I often find it hard to sleep at all when I know I've got to be up early to get to an airport; my mind is thinking about loads of things, have I forgotten this, that, will the taxi turn up, what if there's a delay.. etc.
If I could instead get on a train and know 'I'm on it' then I could easily relax as I'm on my way (unless it then breaks down!).
What tends to happen with an early AM flight is that I get hardly any sleep and try and catch up on a plane. Funnily enough, planes are a bit noiser (and bumpier at times) than your average train!