Welcome
It's great that you're here to show support for your husband; he's a very lucky man. 2 degrees, and on to his 3rd; that's very impressive. May I ask what he has studied?
Haha, most of my friends and family will tell you that I can be a bit hyper at times, but I don't know if that's an Aspie thing, or just me being happy. I have this odd trait, where I swing between mature, serious adult, to happy-go-lucky kid. It's usually set off by the mood I'm in, or the people I'm around.
For me, I wasn't always very good with initiating fist contact, even if I wanted to speak to people. It was something I was unaware that I did for so long, until someone brought it up. It was odd, because my friend told me that she felt alienated by me when I didn't bother to call her. When she told me that, I would think to myself...why didn't I call her? We talk more often now, especially on Facebook. Since then, I've had to actively try to reach out, as it would usually never occur to me to do so. I know that sounds odd, but it's just how I work, though I think it's an Aspie thing. People used to mislabel me as shy. Now that I've learned to be more outgoing, people now consider me a bit more social; though I still enjoy my quiet times, and prefer small groups of people, as opposed to crowds.
As for relaxing, I can relax well under the right circumstances, but many things can easily stress me; especially when other people are unaware of those simple things that do cause stress. Most people would probably never even consider those things. Perhaps ask him what stresses him out, or when he is stressed, try to talk to him to better understand it.
Generally speaking, I think it's best to take the initiative to ask Aspies how they feel, and tell them how you feel. It's not that we don't care; most of the time we care very much; sometimes too much. Some of us just don't initiate conversations well.
Well, hope that helps