We use sucrose on our babes, using a leuer tip syringe. It works best with the older/bigger babies......put a drop or two on his (or her) tongue, and watch him taste it and smack his lips. Then put a paci in. It won't work on every baby, but it helps some. It's also useful with starving breast feed only babies, with or w/out a paci.
At least it can help them fall asleep till mom comes back.