| Your insulin requirements will change sporadically throughout the year, for no apparent reason. Unfortunately, that's life. It could be that you've put a little weight on. Maybe your honeymoon period's over. Maybe you've got a mild infection. Perhaps you've been under a bit more stress lately. It could even just be a change in the season - March is the time of year (along with October) when this forum seems to have a sudden flurry of people having trouble with their BGs all of a sudden.
It does sound like you're getting dawn phenomenon though - do you eat breakfast in the morning? If you don't, then start. After a week or so your body will be conditioned to expect a burst of energy in the morning and will tell your liver to keep quiet. Otherwise, increase your basal dose, and maybe even move which time you take your basal.
Another thing though that might be causing problems is the Somogyi Effect. This is what happens when you have a hypo in your sleep, don't wake up and your liver dumps glucose to stop the hypo. It could be that you are having night hypos and the increased basal is actually causing your liver to dump more glucose, causing high readings. This process is pretty draining on the body, which could account for your tiredness. On the other hand, generally high BGs will also make you feel tired.
The best thing to do would be to do a nighttime BG test and see what your BG is doing before you normally wake up. This will let you know whether you're having night hypos, dawn phenomenon, or just not getting enough insulin.  | 
