You wrote: "the psychiatrist he went to recently doesn’t think he has the highs that a bipolar person would" -- how do you know the psychiatrist said this? Did your husband sign a release for you to discuss him with his doctor? Given everything you wrote, including "periods of poor sleep in which he tends to get a lot done" and his family history of bipolar disorder diagnoses, I would seek a second opinion, or a more detailed explanation considering those two factors.