PSQI	Pittsburgh Sleep Quality Index
SE	Sleep efficiency
TST	Total sleep time
SL	Sleep latency
WASO	Wake after sleep onset
NASO	Number of awake after sleep onset
GABA	γ-aminobutyric acid
RCT	Randomized controlled trials
CBT-I	Cognitive behavioral therapy for insomnia
M	Mean
SD	Standard deviation
MD diff	Changes in mean
SD diff	Changes in standard deviation
SMD	Standardized mean difference
r	Correlation coefficient
CI	Confidence interval
min	Minutes
MT	Melatonin
NREM	Non-rapid eye movement
5-HT	5-hydroxytryptophan
NAT	N-acetyltransferase
SNAT	Serotonin N-acetyltransferase
ASMT	Acetylserotonin O-methyltransferase
SCN	Hypothalamic-suprachiasmatic nucleus
TPH2	Tryptophan hydroxylase 2
PUFA	Polyunsaturated fatty acid