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Depending on your metabolism, the length of time it takes to eliminate half of the Adderall XR is 13 hours, and for Adderall IR, it can be about 10 hours. With many of the side effects such as insomnia or loss of appetite, sometimes your system will overcome the effects and you can sleep again even though you took the Adderall in the morning, and other times, you need to talk to the person prescribing to see if another medicine is right for you. Check to see if you can take melatonin at night, or perhaps there are other things you can do.