Postpartum fatigue

My baby is 12 months old and I’m still struggling with fatigue. He’s a good baby. Has slept through the night for a while now. I do wake a few times during the night to check the monitor. He wakes around 730 so it’s not too early. I just don’t understand why I feel so tired all of the time. He takes two naps a day. I usually take a nap during his first nap and I try to lay down and rest during the second. I don’t have energy for anything. I stay at home and can’t even keep the house clean. I feel like a failure because I can’t seem to do the things that need to be done. Anyone else have this happen?