Generally, Levemir peaks at about 8-10 hours after injection. Thus a nightime shot at 10pm would peak around 6am. So it is the nighttime injection that should be increased if you need to lower your waking number. The compromise is that you want to avoid nighttime hypos. You should average your numbers over a period of days, or better for a week in order to make better informed changes. Our day to day variations are just too much.
But I have to be honest, most of us who depend on insulin would kill for your numbers. And you need to confirm with your endo if he meant that you should have a morning waking number target of 90 mg/dl or that you should have a fasting target of 90 mg/dl between meals. This can be a big difference.