There is a very rare side effect to prednesone that you should be aware of. It happened to my sister and it was terrifying (would have been less so if we all knew what was happening)
Prednisone psychosis. Its linked to insomnia, but after days of not sleeping results in a psychotic breakdown. We had to do 72 hour hospitalization in a psych ward for my sister and it took a lot to bring her back to normal. It was terrifying. We didn't know if it was an onset of schizophrenia or bipolar or what.
I"m not trying to scare you, but some people when they cannot sleep from prednizone develop a psychosis and if memory serves not every one comes out of it like my sister did within a few days, but rather months later. Be on the look out for hallucinations, lucidness, strange talking, incoherence. Again, its a very rare side effect, but it happened in my family. My sister, though asthmatic, will never touch that drug again.