תרגום - לטינית-רוסית - Aliquando et insanire iucundum est

Hi Aneta!

I have a question here:
валять дурака - means "to be lazy", "to do nothing (serious)". Is this the meaning?
Can the meaning be "to go crazy", "to be insane" (сходить с ума)?
I have some doubts as I see insanire in the request, but I don't understand Latin so good to be sure!

Thank you !!!

Yes, dear Siberia. You're right. I meant rather "to be crazy", not "to be lazy", so you can change it, if you don't mind.