Unless you have to keep it in the bear canister.

Or you may have a bear warming you up by climbing in with you.

I can't really do that... and wouldn't recommend that anyone doing the JMT try it. The bears are too busy with your canisters to think they wouldn't just come into the tent. And then there's the story of the gal doing trail work who got the care package from home, and hid her chocolate bar under her pillow so no one else would take it, and woke to a black bear licking her cheek...