Adderall is a stimulant that increases serotonin, norepinephrine, and dopamine levels in the brain. These are chemicals in your brain that help you focus by calming and relaxing... moreAdderall is a stimulant that increases serotonin, norepinephrine, and dopamine levels in the brain. These are chemicals in your brain that help you focus by calming and relaxing you. They also have a variety of effects on sleep. That could be why some people experience tiredness while others do not. According to research, 2% to 4% of children who took the medicine showed low energy and drowsiness. Adults accounted for 6% of the total.Adderall withdrawal may also cause sleepinessStopping Adderall after a lengthy period of use or taking a high dose is a more typical cause of tiredness connected to the medicine. For people who take adderall for off-label purposes and stop using it suddenly may experience sleepiness as a withdrawal symptom. An Adderall crash is what this is called.What can you do if Adderall makes you sleepy?If your tiredness does not improve after making a few lifestyle adjustments, you should consult your doctor and ask him to change your dose as that might be beneficial. Other... less