4 ms·

If you get a 403 error (as I do), here's the latest web archive capture: https://web.archive.org/web/20181017190008/https://www.supermemo.com/en/articles/sleep

• deleted 8y ago
  [deleted]
• movedx 8y ago
  Thank you. I really should donate to the Web Archive because it's just such a useful resource.
  • rz2k 8y ago
    An easy way to contribute a small amount is through Amazon Smile (0.5% of your Amazon purchases): https://smile.amazon.com/gp/chpf/homepage/ref=smi_se_scyc_srch_stsr?q=internet+archive https://smile.amazon.com/gp/chpf/homepage/ref=smi_se_scyc_sr...
    • movedx 8y ago
      I didn't even know that existed. Cool. Thanks for the heads up.