This neurotransmitter plays a role in much more than just our reward system too. Dopamine levels contribute to mood, sleep, focus, and memory, among other areas, which is why an imbalance could significantly impact how you feel. Some research suggests that a dopamine deficiency could be associated with depression, although the connection isn’t fully understood yet.If you’re unsure of your dopamine levels and would like to learn more, talk to your doctor about testing. The good news is that there are several effective, med-free ways that may help boost your dopamine levels, according to research.