Hi,
Lantus? Around your "usual time." As directed by your doc or DN.
Your previous evening/nights Lantus dose would be tailing off anyway..
If you have had your meal out of your usual routine? Then keep an eye on your blood sugars a little more closely..
But the idea of basal/bolus (MDI) treatment on the whole, was originally designed with mealtime patient "lifestyle" flexibility in mind...