Related by context. Frequent words. (Click for all words.) 65 REM sleep 57 arousals 52 restorative sleep 52 sensorimotor 51 wakefulness 51 EEGs 50 Parkinsonism 50 muscle rigidity 50 oscillatory 50 oxygen uptake 49 circadian 49 polysomnography 48 nystagmus 48 electroencephalogram EEG 48 wakeful 48 blood oxygen saturation 48 paresthesia 48 REM 48 ambulation 48 electroencephalography 48 circadian rhythm 47 neovascularization 47 electroencephalography EEG 47 sensory stimuli 47 sleep disorders 47 affective disorders 47 awakenings 47 circadian rhythms 47 circadian clocks 47 locomotor 46 Obstructive sleep apnea 46 syndrome RLS 46 neuronal activity 46 circadian clock 46 neurologic disorders 46 neurobehavioral 46 hormone melatonin 45 transcranial magnetic stimulation 45 Respiration 45 spatial orientation 45 endocrine diseases 45 pulsations 45 psychomotor 45 cataplexy 45 thermogenesis 45 diurnal 45 muscle twitching 45 affective disorder 45 neurophysiology 45 biphasic 45 binaural 45 sleep disturbances 45 electrical conduction 45 Sleep Disorder 45 electroencephalogram 44 oscillations 44 electrocardiographic 44 synaptic plasticity 44 skin conductance 44 otolith 44 Radiographic 44 loud snoring 44 ciliary 44 BPPV 44 visuospatial 44 Nitric Oxide 44 sleep 44 sensorineural hearing loss 44 excessive sleepiness 44 respiration 44 magnetic stimulation 44 electrodes implanted 44 Physiological 44 Restless Legs Syndrome 44 somatic symptoms 44 basal metabolic rate 44 Physiologically 44 cognitive function 44 electrophysiological 44 Ghrelin 44 neurophysiological 43 hippocampal 43 dyskinesias 43 hypoxemia 43 metabolic 43 daytime sleepiness 43 autonomic nervous system 43 muscle contractions 43 contractile 43 synaptic transmission 43 gastroesophageal reflux 43 pineal gland 43 cardiorespiratory fitness 43 RLS symptoms 43 neuropsychological tests 43 brain lesions 43 amplitudes 43 Hyperactivity 43 neurotransmitter serotonin 43 Graymark 43 Mild Cognitive Impairment