Im picked up a a self made mage from summurset and then i got an idea:

I thinked if i pick up a critical weakness to paralsys the natural "inmunity to paralysis" atrib from the class will override them, neutralising the weakness.

Is this right?

Because i get a sudden death while resting (from black screen that you see while resting DIRECT to death animation, i dont see NOTHING,,, it was INCREDIBLE... and i had a lot life at the time -rest was for mana- and magic inmunity) and i suppose it was because of this... some sh.it paralysing me... and good bye.

Yes. Or, you could take "Immunity to Magic" if you're not a High Elf, and offset it with Critical Weakness to Paralysis.

All Paralysis effects are also Magic effects (Unlike Elemental damage spells)

I knew it... i knew pick up elemental critical weakness because you have inmunity to magic was a bad idea.

But them What did happen to my char? i dont get it, not even saw what atacked me.

Maybe a bug killed you?

Doesn't trying to rest while poisoned have those symptoms? You're basically dying in your sleep.

May be... i was surrounded by spiders.

Critical weakness to paralysis on an Altmer usually just gives you a free advantage at no extra cost to the difficulty to level rating. The immunity is still in effect.