We had two sleepless nights (Friday and Saturday) and one semi-sleepless night (Sunday). She was in so much discomfort as you can see in the picture below.
We got in to see Dr Pat, our wonderful vet, who carefully examined her and took X-rays. The diagnosis is arthritis in her neck, shoulders, and hind legs, and this was a very bad flare up. Greta is now on meds for it.