I don't think that it's so easy to generalise
In my experience, coders fall into several categories.
Those who code for the joy of it, code whenever they can. I know several who got up at 6am just so that they could get an hour or two on their pet project done before sauntering into work. Age plays a factor in terms of common sense. Those in their 20s went out drinking & socialising in the evening and burnt the candle at both ends. Eventually their health suffered and they looked like the walking dead. A wake-up call usually came in their early 30's.
Those who for whom coding is just a job tend, I have noticed, to work 9-to-5 and the overtime required to get projects finished. They also tended to look healthier. Those in their 20s usually moved into another field and those older who were/are good enough to get the job done within the time allotted.
The poor bastards in this study are in India. I suspect that Mysore is a sorry pun for the workers there. The image that comes to mind from this study are the people who built the pyramids. My experience with Indian coding companies dealing with outsourced work is that the coders there last about 6-9 months before they disappear. Now, it may be that they were moved to other projects, but I suspect not.