I take mine in the evening.
But, my understanding is that it doesn't matter WHEN you take it, as long as it's at the same time everyday, whether morning, afternoon or evening.
Someone correct me if I'm wrong. I know some are timed as to when your natural blood sugars (if you weren't diabetic) would be higher, but I don't think that is true with the Lantus, since it's a "background" insulin.