Nothing very profound here--just an observation by Joseph Wood Krutch on the long northern winters and various ways that some animals have found to handle them.
...as usual it is the cats who are provided with the most perfect mechanism. They are, to be sure, capable of a kind of short-range impatience--when, for example, food is being prepared. They seem at time to suffer momentarily from boredom, as a wild animal perhaps never does. But when the weather is too bad to go out, or when for any reason there is absolutely nothing to do, they can simply curl up and sleep almost endlessly, for days at a time if necessary, with perfect ease. Even going to sleep seems to be a process entirely under their control, as voluntary as shutting the eyes is for us. Cats are rather delicate creatures and they are subject to a good many different ailments, but I never heard of one who suffered from insomnia.
Cats with insomnia: sounds self-contradictory or mutually exclusive to me.