From memory (hopefully someone will come along shortly with the reference that I cannot find) flying solo under supervision only applies to ab initio PPL students and those who have sent in their initial PPL application but are waiting for licence issue. Although some have obviously managed to include night training whilst ab initio students and be issued with a licence I'm of the opinion they slipped through the net.
The OP has a licence, albeit lapsed, how can he complete the solo requirement of the night training if he's no longer a student?