As far as I can see, especially with the number of the people who experience this, it seems to me that the Crohn's disease and the medications combined may actually cause the night sweats, regardless of infection. IMHO.
You're trying to seperate two things that are inseparable, an immune response happens in both crohn's disease and in infections (reminder that if crohn's disease is an infection or not is open for debate, I have posted enough studies to support this surrounding LF82 and plenty of other pathogens that invoke an immune response, a big part of people who have crohn's disease are infested with LF82, LF82 is a pathogen, not a commensal, which is an infection, regardless if it is causative or not. At the very least, a subset of crohn's disease patients have infections, not up for debate, the evidence is plentiful, each moth new evidence shows this.). Both induce fevers.
In infections the cytokine being released from macrophages and upregulation of cytokine by the immune system cause changes in temperature, in cron's disease macrophages are releasing cytokine also, that's why you have granulomas at lesions in crohn's disease, they're concentrations of macrophages, which shockingly, release cytokine in crohn's disease patients that are able to induce fevers.
In crohn's disease there is a barrage of cytokine present in the intestine, why they are there is up for debate, that they are able to regulate body temperature is not up for debate.
You can argue that prednisolone is causing fevers, which is fine although the why hasn't been explained by you, but the fact is that many people with crohn's disease have the fevers long before they go on medication, and the fevers correlate with the inflammation, and the mechanics behind the night sweats can be easily explained the same way the night sweats in tuberculosis are explained, the immune system is a temperature regulator.