Hi all. Just my two cents here. My son, now eight and a half, has had a g-tube and overnight feeds since he was eighteen months.
As for the enzyme question, we were initially told that he didn't need enzymes with his feeds, as it was "elemental", or broken down already, but we wanted to give enyme anyway to avoid any malabsorption issues and maximize the nutrition he got from it. We were given Viokase and told to give it at the beginning of the night/feed. This didn't make sense to us either, so we gave it at the beginning and the end. We make a suspension of about 8cc water and 3/4 tsp of Viokase and deliver it via extension tube, then hook him up.
Now, ideally, if you accept this logic, you should give enzyme halfway through BUT there's a limit to what you can do and survive long term! We needed some sleep and this seems to work well. Ditto for refilling the bag half way through the feed. We've always filled the bag with the whole feed and let it run over about seven-eight hours with no spoilage problems. This allows the parents up to about seven hours of sleep at a time (on an ideal night. Who has those?) Doesn't that sound wonderful?
His formula now is Peptamin-I think there are any number of "elemental" ones out there.
Also, we have been told by more than one person (nurses, nutritionist etc) NOT to put his enzyme IN the feed-either the Creons or the Viokase, as they will lose potency.
I have no answer to the phantom alarm syndrome, as I hear it too!