I recently dreamt I was giving writing advice to some people and awoke with 2 bits of almost-plausible sounding advice in my head:
1. Don't allow your character to remain inactive for more than 2 hours.
2. Always write death scenes in the morning when you have more emotional energy to put into them.
After posting about this on a writing group I'm in, Helena Bell was inspired to blog about The Greatest Writing Advice in the Entire World. Take a look - it's brilliant.