What Causes Tiredness While Sleeping In My Own House?

Hi, my house makes me tired. VERY tired. My husband has the same problem. If we sleep somewhere else we feel rested, but in our own house, we re always tired. Fatigued. On days where I m home all day, it gets worse. We have no mold issues and it s a fairly new home. Could it be radon? Or something else? Thank you