Welcome to the family, KSpace. Your response to the Asacol sounds a lot like mine. I reacted the same way to Rowasa. My GI ended up changing me to Colazal, which I tolerate well.
Most of us here will tell you that steroids do make it hard to sleep. They make some people "foggy", others nervous. Me, I just got really cranky when I was on them. My husband called me his "attack wife."
Sometimes it just takes a while to find the right key to help you. Most doctors work pretty systematically through the available drugs, and hopefully you'll find your magic bullet soon.
Moderate to severe left-sided UC (21 cm) diagnosed 2001.
Intolerant to Asacol and rectal mesalamine preparations.
On Prednisone then Entocort 2001-2006 with only short periods off.
Current meds are Colazal,
Azathioprine Remicade, Nature's Way Primadophilus Reuteri.
In remission since April, 2006. Remicade has been my wonder drug.