Related by context. Frequent words. (Click for all words.) 77 circadian rhythms 76 circadian clock 74 circadian rhythm 61 wakefulness 60 melatonin 58 glucose metabolism 58 metabolic 57 insulin secretion 57 autonomic nervous system 56 metabolic processes 56 leptin 56 REM sleep 55 serotonin 55 biological clocks 55 metabolism 54 brain circuitry 54 neurones 54 protein synthesis 54 physiological 54 telomere length 54 neurogenesis 54 gene expression 54 physiologic 53 neurons 53 signaling pathway 53 signaling pathways 53 phosphorylation 53 SIRT1 53 secretion 53 plasticity 52 neurobiological 52 homeostasis 52 metabolic pathways 52 synaptic 52 epigenetic 52 cortisol 52 neuronal 52 inhibitory 51 cortisol levels 51 mutant mice 51 ghrelin 51 neurodegeneration 51 cytokine 51 basal ganglia 51 cognition 51 Drosophila 50 BDNF 50 C. elegans 50 synchrony 50 photoreceptors 50 cortical 50 neurotransmitter 50 adenosine 50 ion channels 50 miR 50 molecular mechanism 50 overexpression 50 endocrine 50 zebrafish 49 phenotype 49 sleepiness 49 transcription factors 49 mammalian 49 transcriptional 49 glucocorticoids 49 visual cortex 49 mTOR 49 mitochondria 49 Melatonin 49 Akt 49 genes 49 oscillations 49 hypothalamus 49 DNA methylation 49 cognitive functions 48 biological pathways 48 microRNAs 48 neural 48 neural pathways 48 cognitive function 48 endogenous 48 molecular mechanisms 48 knockout mice 48 glutamate 48 dopamine 48 mitochondrial 48 excitation 48 phenotypes 48 daytime sleepiness 48 prolactin 48 cytoskeleton 48 immunological 47 adiponectin 47 transcription factor 47 ion channel 47 methylation 47 receptors 47 nerve cells 47 signaling molecules 47 protein kinase 47 cognitive functioning