What's the plural form of insomnolence? Here's the word you're looking for.
Answer
The noun insomnolence can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be insomnolence.
However, in more specific contexts, the plural form can also be insomnolences e.g. in reference to various types of insomnolences
or a collection of insomnolences.