Error(s) in re-building vignettes:
--- re-building ‘Spectral_analysis_sleep_electroencephalography.Rmd’ using rmarkdown
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

Quitting from lines 36-48 [edf_read] (Spectral_analysis_sleep_electroencephalography.Rmd)
Error: processing vignette 'Spectral_analysis_sleep_electroencephalography.Rmd' failed with diagnostics:
'curl' call had nonzero exit status
--- failed re-building ‘Spectral_analysis_sleep_electroencephalography.Rmd’

--- re-building ‘Using_rsleep_and_SleepCycles_packages_to_detect_sleep_cycles.Rmd’ using rmarkdown
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

Quitting from lines 53-67 [hypnogram] (Using_rsleep_and_SleepCycles_packages_to_detect_sleep_cycles.Rmd)
Error: processing vignette 'Using_rsleep_and_SleepCycles_packages_to_detect_sleep_cycles.Rmd' failed with diagnostics:
'curl' call had nonzero exit status
--- failed re-building ‘Using_rsleep_and_SleepCycles_packages_to_detect_sleep_cycles.Rmd’

SUMMARY: processing the following files failed:
  ‘Spectral_analysis_sleep_electroencephalography.Rmd’
  ‘Using_rsleep_and_SleepCycles_packages_to_detect_sleep_cycles.Rmd’

Error: Vignette re-building failed.
Execution halted