Sleep problems even if meds work?

My teen daughter has epilepsy, newly diagnosed last year. She also was diagnosed with the depression a few months after being diagnosed with epilepsy. Something about all these conditions and/or the meds caused her to have a lot of daytime sleepiness. So she will sleep through the night and the epilepsy meds also seem to be working as she does not seem to be having seizures anymore, but then she is still often very tired and sleepy during the day. She’s been on all her meds for at least six months or more so any adjustment period should probably be over by now.

Does anyone with both of these conditions experience daytime sleepiness even though your meds are working ?