Does Cyclobenzaprine increase opioid effects

[Toreadores]

I was prescribed Flexaril (Cyclobenzaprine) 10mg 2 days ago for pinched nerve on my back, I also take oxycodone 30mg for post surgery pain and I've noticed somewhat an incresement of the oxy's recreational effect. I took the 2 medicines about 4 hours apart ( flexaril 1st) and I am not sure if it's just placebo effect or it really does boost oxy's effect. I have tolerance to the oxy so 30mg usually give me just slight buzz that lasts about 45 minutes, this time it felt maybe 25 % stronger and lasted about 2-3 hours. I am wondering if I can take both pills together or 30 min apart to increase oxy's effect even more but want to make sure if it really has the certain effect and maybe try with lesser dosage or is it just in my head and the whole thing is one big coincidence?

Any thoughts?