There was one morning this season that I could not make a sound with my trumpet. Most mornings I do struggle for the first few calls of the hunt but it usually gets better as I call. I carry a water bottle with me and drinking a little water seems to help, helps with rasp too. I think it has something to do with hydration and tightness of your lips first thing in the morning. I have a friend that swears by Biotene first thing in the morning before he uses his trumpet. I always have a slate call for purring, so I can always fall back on that.