I tried a splint pretty much 24/7 - not just nights. Also tried the NSAIDS & cold packs. All helped for a time.
But, eventually, it got bad enough I had to choose between steroid injection & surgery. I decided to have the steroid injection & so far, so good. They warned me that it might spike my BG up to 50 points for two-three days, but it didn't. It took seconds, wasn't too painful, & wasn't expensive at all with my insurance. I saw an ortho doc.
Good luck. Let us know what you decide!