Hello

From what I have read the 2 hour difference does make a difference but for me personally it does not. It is true that you are looking for a pattern. If you notice that your temps are fluctuating weird on the days that you are sleeping later then I would try settint a little alarm temping and going back to sleep...a pain I know. From what I have read the later you get the higher the temp but Im not really sure why.
Good luck!!
baby dust