I, on the other hand, am up. I got up at quarter to nine to do some research. Last night before falling asleep I Googled "word doc turning to asterisks" - I saw that this was a major problem and a bug in the new Office software. The complaints had begun last summer. People had already figured out several tiresome workarounds or protections, like saving every two seconds or backing up to Time Machine every fifteen minutes or, if the problem happened, quitting out of Word immediately without saving, because once Word auto-saved it would auto-save the asterisks. The one thing that was so sadly typical was that Microsoft was trying to blame everything but themselves. Behind the scenes, though, they could not get the bug to happen so they couldn't trace it.
At some point in the last month or so, they found it and apparently fixed it. It's more than a little peculiar that the people I talked to didn't ask if I'd done any updates since getting this computer. I hadn't and they don't show up in auto-update for the Mac stuff - you have to do them separately, although there is a way in Word preferences to do it automatically, although posters on the forums I visited said it wasn't reliable. I installed all the updates including a very current one and hopefully this problem is now gone forever and I can write in comfort and with a feeling of safety.