ANS	Autonomic nervous system
ApEn	Approximate entropy
BH	Benjamini–Hochberg correction for multiple comparisons
CDM	Complex demodulation
CI	Credibility interval
Cpm	Cycles per minute
CRS-R	Coma Recovery Scale-Revised
DDL	Dynamic daylight
DfaAlpha	Detrended fluctuation analysis scaling exponent
DOC	Disorders of consciousness
ECG	Electrocardiography
EEG	Electroencephalography
EMCS	Emergence from minimally conscious state
EMG	Electromyography
EOG	Electrooculography
fMRI	Functional magnetic resonance imaging
HF	High frequencies (0.15–0.4 Hz)
HL	Habitual light
HR	Heart rate
HRV	Heart rate variability
Hurst	Hurst exponent
IBI	Interbeat interval
LF	Low frequencies (0.04–0.15 Hz)
LF/HF ratio	Ratio between low and high frequencies
MCS	Minimally conscious state
NTBI	Non-traumatic brain injury
PE	Permutation entropy
PSG	Polysomnography
RMSSD	Root mean square of successive differences between adjacent heartbeats
SampEn	Sample entropy
SDRR	Standard deviation of interbeat intervals
TBI	Traumatic brain injury
UWS	Unresponsive wakefulness syndrome
VLF	Very low frequencies (0.003–0.04 Hz)
WTS	Wald-type statistic