Always falling asleep on the way home from work?

Many possible causes: I hope you're not driving when you're falling asleep! There are many possible causes including anemia,thyroid & other hormonal imbalances,vitamin/mineral/amino acid deficiencies, all sorts of chronic infections (viral, bacterial, fungal, parasitic), environmental or food allergies, environmental toxins, sleep apnea, stress etc. We can not tell you here; please see a good Dr. (ideally Integrative).