Effects of light and sleep stages on heart rate variability in humans.

@article{Tsunoda2001EffectsOL,
  title={Effects of light and sleep stages on heart rate variability in humans.},
  author={Makoto Tsunoda and Takuro Endo and Satoko Hashimoto and Sato Honma and Ken ichi Honma},
  journal={Psychiatry and clinical neurosciences},
  year={2001},
  volume={55 3},
  pages={285-6}
}
Effects of light intensity and sleep stages on heart rate variability (HRV) were investigated in young healthy subjects. The low-frequency (LF)/high-frequency (HF) ratio was significantly increased by exposing either to bright lights of 10 000 lx or to extreme darkness (< 0.01 lx), while HF and LF components of HRV were not changed, when compared with those under dim light (100 lx). However, LF was significantly increased at REM sleep, when compared with that at the pre-sleep wake. In contrast… CONTINUE READING