Any way to save a document before force-quitting?

I’m working in Pages on a document with many large images, and I seem to have overwhelmed it. It’s been ‘thinking’ for a while, and quitting other programs and putting the laptop to sleep doesn’t help. I would normally force-quit (and it is listed as “not responding”), but I’d really rather not lose my last hour’s work since I saved, plus a new document I haven’t yet saved at all. I’m not able to copy text to email it to myself (for example). Any other ideas?