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