Hi Sun43 - I take mirtazapine with pregabalin. I also used to get the restless legs from mirtazapine - usually about an hour after taking it, so I'd take it immediately before going to bed and hope that I'd sleep through the legs, which lasted for an hour or so. I'd also get myoclonic jerks to add to the fun. Since I've started taking pregabalin, that all seems to have stopped, so it may work for you as well.
When I was working (I retired in 2016), I would also get the diurnal thing, waking up anxious in anticipation of everything I'd have to do that day, so I'd take all my pregabalin in the evening to try to reduce or prevent that. Now I don't have the stress of work (but other health problems you can see over on the neurologist thread, unfortunately), so I split my dose evenly morning and night, which helps keep me calm. I'm also taking 600 mg daily of pregabalin, so there's room for you to go up , if necessary. Good luck with pregabalin and other meds, whichever way you go.