| Your basal needs vary throughout the day - a lot of people have liver dumps first thing in the morning which means they generally need more insulin.
Bear in mind though that changes to basal insulin usually take anout 3 days before you can really start measuring the impact, and also an adjustment of 1u usually has very little effect anyway. You sure you just haven't done something different that resulted in waking up with higher bg (illness, less exercise, slightly more food)?
If you really find that you need less insulin during the day than at night, you might want to split your Lantus dose and inject every 12 hours, rather than every 24. Say, 60% of your total dose at 10pm, 40% at 10am. Alternately, you can just a smaller amount of Lantus full stop and take 1-2u of your bolus insulin before going to bed. Or cut out your evening snack.
Best advice I can give you is that you can't treat T1 with diet - I know that sounds obvious so let me explain. If there's a problem with your control, don't eat more or eat less - adjust your insulin instead.  | 
