its worthwhile if you want to practice what you have learnt during the day I suppose as the slopes are virtually empty. Also good if you want to have the extra space that is available because all the schools are away!
Its cheap and worth it if you would prefer this to heading off for the beer!
Night skiing is from 5pm till 9pm (lift stops at 9, lights go off at about 10. The lift pass costs 20 lev for an adult and half price for under 12's. Some of our group tried it last month and had great fun as the slopes were practically deserted.