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  1. Here are the results from the recent CR and Sleep Survey, as a follow-up to the General CR Survey conducted a couple weeks ago, whose results are available here. This time where were 20 respondents, with 70% men and 30% women. The age distribution was skewed much younger than the first survey. Here is the data (click to enlarge): There was also a greater proportion of people with higher BMIs this time: and with fewer years of CR under their belt, although we had a good contingent of veterans as well: Overall, CRers reported sleeping about 6.8 hours per night on average. Here is the distribution: Overall, CRers reported sleeping about 0.8 hours less per night on average since starting CR. Here is the distribution: CRers reported that by far the most common sleep problem was "early waking". Here is the distribution of sleep difficulties: Here are some interesting interactions between CR practices and sleep characteristics that showed up in the data. As usual, the numbers are small and so these should be taken as trends and with a grain of salt: While the number of reported nightly hours of sleep did not differ based on duration of CR, CR veterans (> 10 years) reported a greater reduction in sleep time than people who've been practicing less than 10 years (-0.91 vs. -0.21 hours, respectively). People who waited 2-4 hours between their last meal/snack and their bedtime reported less of a decrease in their time spent sleeping than either people who waited less than 2 hours, or greater than 4 hours before going to bed (-0.25 vs. -0.9 hours, respectively). So if you want to lose less sleep as a result of CR, it appears best to wait a moderate time between eating and going to sleep. The biggest impact on sleep seemed to be the result of BMI. People with a BMI less than 20 reported sleeping 40min less than those with a BMI > 20 (6.47 vs. 7.14 hours respectively). The skinnier folks also report that this was "too little" sleep more often than the heavier people (63% vs. 9%). In summary, it appears that CR tends to decrease the amount of time people sleep, with people practicing CR for more years, and more severe CR (as measured by BMI) tend to experience a greater decrease, and "early waking" seems to be the most common cause of this sleep reduction. Thanks to everyone who participated! --Dean
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