Welcome to Health Care Magic..
I read your query at it is not likely to be mini stroke
as he is normal without symptoms of numbness
or weakness of limbs
1) excessive tiredness
3) Petit Mal syndrome in which he will be state of unconscious for quite a minute and returns to normal state as before.
I suggest your husband to get checked for blood pressure and blood sugar level for early diagnosis and interventions.
Do not be worried as he is perfectly alright.
Get consulted if symptoms reoccured another time.
Hope this information is helpful.
Thanks & Take Care.