How sleep-deprived are academics?

I recently ran a poll on Twitter to see how much or how little sleep academics are getting. The majority of the respondents of the poll (70%) are getting between 6 and 8 hours of sleep per night, as recommended. However, 20% of the respondents are getting less than 6 hours on average, which may lead to adverse health effects in the long run. A few years ago I wrote an article on why depriving yourself of sleep is a bad idea, and what you can do to get better sleep.

Here are the poll results and the wake of the discussion: