i agree with trmichels the moon won't have much effect on elk.the elk will be SCREAMING all night long. you won't sleep, the moon will probly keep you more awake knowing the elk are in rut and YOU CAN HEAR THEM. i'm assuming that you have a rut hunt? all the elk have on their minds is all the cows they can steal for them selves. they are gonna be up most of the night rutting, fighting, eating, bugling etc. etc. wish i was going with you!!!