[AnimalMuppet]

See my other post (https://news.ycombinator.com/item?id=30921217) for what I think consciousness is. So, no, some brain activity is not enough.

And, either after sleep or after anesthesia, I can tell that it wasn't continuous.

If continuity doesn't matter, then something still may be lost on upload - we won't know until we can interview someone who's been uploaded. And in death, if you don't believe in life after death, then something is definitely lost - the possibility of restart.