DD6 fell asleep on the couch yesterday afternoon and slept straight through until this morning. It didn't concern me because she was after several late nights in a row.
When she woke up, I sent her to wash negel vasser and she stood up and then sat down immediately and said she had to wait because her foot was shaking. She commented that she had also noticed it shaking yesterday. When she stood up again, I did not see any shaking.
She also told me that in school yesterday she noticed her hand shaking when she wrote.