a decreasing trendp > 0.05
(2) In the frequency domain, both LF and LF/HF significantly increased after sleep deprivation ( p < 0.05), whereas HF showed a decreasing trend that did not reach statistical significance ( p > 0.05).
(2) In the frequency domain, both LF and LF/HF significantly increased after sleep deprivation ( p < 0.05), whereas HF showed a decreasing trend that did not reach statistical significance ( p > 0.05).