We're just past the anniversary of the last mishap: http://www.spacex.com/news/2015/07/20/crs-7-investigation-up...
I also get the feeling that extra sleep and recovery time encourages the kind of creative thinking that recognizes unusual ways for things to go wrong and corrects for them in advance.
Wouldn't surprise me in the least. I know Musk claims that "working at Tesla/SpaceX is like being in the special forces", but there's no way that every employee at these companies has the work capacity to stay 100% focused through 80 hour work weeks all the time.
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