What are the consequences of chronic lack of sleep? For example, insomniacs are known to sleep less than normal sleeping individuals.

I am wondering if there are any long term cognitive impairments from reducing sleep time to, say 4h instead of the normally recommended 8 hours in the long run, say for a year or so?

  • $\begingroup$ The websites I link to in my more specific question mentions a couple of cognitive impairments, and I also list articles which state how some of them are overcome in the short term. Perhaps these sources can help you formulating a better sourced, well-defined, question? Specifically, "attention-dependent neural processes do not normalize after this period of time in habitually short sleeping individuals and may require longer recovery periods". $\endgroup$ – Steven Jeuris Oct 18 '17 at 9:02

Wikipedia has some good information on this issue. Search for:

Effects of sleep deprivation on cognitive performance

In summary, 'yes', sleep deprivation can have a multitude of negative consequences on your cognitive abilities, like weakening your ability to handle complex cognitive tasks.

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