Feeling guilty

Guys I feel really guilty. I’m working from home still and have found myself so entirely exhausted lately that I cannot keep my eyes open. I intended to take a quick 30 minute nap that turned into 3 hours today. During the work day. And I feel horrible about it. I’m not super busy so I’m not missing deadlines or anything, but I still feel guilty. Why am I so exhausted? I get 8-9 hours of sleep. I eat well. I exercise. My kid is high energy but is at daycare during the week and naps and sleeps well. I don’t understand. I physically could not get up from sleeping today. My body felt like a giant dead weight. And now I’m finally alert enough but I still feel like I could sleep for a month. What is wrong with me?