Definition of "fidgets"

‘Sit down, do, — I can’t abide to see folks standing; it gives me the fidgets.’

1897, Richard Marsh, The Beetle

His voice was deep and rich and somehow took the fidgets out of them. They now felt glad and quiet and it didn't seem awkward to them to stand and say nothing.

1950, C. S. Lewis, The Lion, the Witch and the Wardrobe