light ones life (noun) apple of one's eye: cherished one
Sinonime: adrenalizing, animating, appealing, arousing, bracing, breathtaking, challenging, electrifying, energizing, enlivening, exhilarating, gripping, hair-raising, hectic, inspiring, interesting, invigorating, lively, moving, provocative, rousing, spine-tingling, stirring, thought-provoking, thrilling, titillating, vitalizing, vivifying