They definitely have issues :P but I think .. speaking in terms of their daily lives they are incredibly sane!

Maybe not insane. Passionate maybe? About their jobs and stuff. They're insanely cute and funny. Does that count? x]

Not at all, which is surprising! Them boys are incredibly resilient! :))

in·sane /ɪnˈseɪn/
–adjective
1.not sane; not of sound mind; mentally deranged.
2.of, pertaining to, or characteristic of a person who is mentally deranged.
3.utterly senseless.

considering the world they live in, they are remarkably level-headed, consistent, and sane. it may seem crazy to choose to be a hunter, but the things that matter to them are family and helping people, so being hunters together and "carrying on the family business" is very aligned with what they value.

What pizzapi said. They have issues, but everyone does. Having a few issues doesn't make you insane- it makes you normal. Considering everything they've been through, they are remarkably balanced. Some of their coping mechanisms aren't very healthy [Dean's drinking especially] but that's not insanity, that's addiction.

yes and this is why we love them...all the character of spn are insane...they're must be like that to do what they do...but insane is not mentally ill person...just a little bit crasy like us...Lol

I think you would have to have a level head to do an insane job like that:)

For sure. All the best characters are.

No sane man can make witty jokes or deliver badass one liners just before he thinks he's going to be tortured/die. It's awesome but not sane. Man....I wish I was like that, like you have no idea.