When do you take it? I've read of some nitrogenous free form compounds, i.e. BCAAs, and similar messing with certain neurotransmitter signaling for sleep, but this IS the first time I've heard of someone doing it with creatine (edit: besides Carlos, which doesn't count because he's foreign and his creatine is almost certainly laced with stimulants).
I don't "approve" of CEE compared to monohydrate, but it'll do the job. I'd just take creatine 1st thing in the AM if this were my issue. On the other hand, I'm not sure if we can "scientifically" say that because you stopped taking creatine in one day and you can sleep that it's the creatine. You ever eat red meat before bed?