Convenience scholars tell readers that the phrase here, loss of voice, refers to an inability to express one’s own thoughts, opinions, and imaginings (inability for whatever reason and however expressed).
Stridulous dreams are harsh and grating.
The writer is emphasizing the idea that this loss and these dreaming experiences affect different people differently.
Source text: Hoarseness, Loss of voice, and Stridulous Breathing by Morell Mackenzie, 1868.