Adderall is a short-acting medication. It is meant to be given two-three times a day to benefit from its effect most of the day.
For some reason, your physician chose to prescribe the medication once a day. I suggest to consult the physician and discuss the possiblity of increasing the frequency of the medication.
If you are worried about the sleep side effects, he can take a dose at noontime so the medication has time to wear off by bedtime. But please consult your physician before any changes to the medication is done.