Angee,

I bet he is coming home mentally exhausted. This is called sundowning in some situations. The persons brain become minimally functional as the sun goes down. If he is not taking any breaks for a nap or at least some eyes closed time, this makes this fatigue even worse. If he drinks coffee during the day, this adds to his fatigue.

Regarding a TBI Support Group. If he will not go, go by yourself. You will benefit from meeting other caregivers. A TBI or Stroke support group with a caregivers sub-group will be valuable. If he decides to go later, great. But, you need the support and knowledge you can get there.