If it's seasonal or gets worse during the winter, sun lamps can help :)

PureGuardian 10,000 LUX Full Spectrum Energy Light with Customizable Blue or White Light Therapy Intensity, Timer, Pure Guardian SPA50CA https://www.amazon.com/dp/B01MS953QF/ref=cm_sw_r_cp_apa_9yJyAbPSX9BMQ