Prednisone, muscle relaxers, and ultram causing memory loss?

I hurt my back badly last week -- I basically was unable to walk for two days. The doctor has put me on 40 mgs of prednisone (tapering down to 10 mgs over 10 days), 5 mgs of cyclobenzaprine muscle relaxer twice a day, and 50 ultram/tramadol for pain killers 4 times a day as needed. I am also using prescription strength lidocaine patches. I feel much better and can move around but I have done some things around my house last night that I cannot remember -- like cleaning up and organizing things that I cannot now find. I have never sleepwalked before. Could this medication be causing me to do this? I was able to drive today perfectly, and I do not drink or take anything else that would cause this.