Synonyms and related words :
affectibility, alertness, all-night vigil, consciousness, impressibility, impressionability, insomnia, insomniac, insomnolence, insomnolency, lidless vigil, limen, openness to sensation, perceptibility, physical sensibility, readiness of feeling, receptiveness, receptivity, restlessness, sensation level, sensibility, sensibleness, sentiency, sleeplessness, susceptibility, susceptivity, threshold of sensation, tossing and turning, vigil, wake, wakefulness