They say that moving house is the second most stressful thing after bereavement. 'They' don't know any authors.
The wait after you've sent your non-fiction proposal or your novel to a publisher is even worse than the house thing. With house sales, it's not the actual move that's so stressful - you can turn that into an adventure - it's the waiting, the uncertainty. And it's even worse for authors.
At the moment we're trying to sell the house and I've a proposal in with a publisher. All sympathy warmly accepted.