I might be wrong but . . . .
I am in the states and it might be different but . . . .
For all my IFR students I did most of their training at night anyway, they were not allowed to look outside so the later time of day did not matter, they got the night time. So why can't you go to your instructor and request the same ? I was always happy when students asked me this because then I could work with the Private / commercial students that needed day light.
Here in the states there is no difference in cost between night or day so . . .