[cardinarky]

I am only telling you about this because I got involved with it for the same reasons your husband exhibits.
I had a very stressful job in Houston, working out of a one person office with corporate in Manhattan. They had NO CLUE about Southern business practices. I was working out heavily and running 6+ miles a day. My weight was at 165# on a 6'01' body. I was in pretty good shape but I was still very stressed.
The running would get the endomorphins kicking in at about the 3 1/2 mile mark but that would only last for a couple of hours.
At the end of the day, to come down off of all the phone calls and such, the herbalists at the local gym I was using told me to try Valerian Root. NOT TO BE CONFUSED WITH VALIUM!!!!
It worked very well and helped me calm down in the evening and sleep normally. It has absolutely no hang over or groggy effects.
Following is a small write-up.

Its mild tranquilizing power has made valerian a popular treatment for anxiety; in Europe, it is often prescribed for that purpose. Unlike diazepam (Valium) and alprazolam (Xanax), the drugs often prescribed for anxiety in the United States, valerian has few side effects.
Some people confuse valerian and Valium, believing that their similar names imply that they are somehow related. They are not. Valium is a synthetic drug, a member of the benzodiazepine family, while valerian is derived from a plant.
There is a connection, however. The herb and the drug seem to affect the brain in a similar fashion, binding to the same receptors. The differences are that valerian appears to be nonaddictive, and its effects tend to be milder than those of Valium.
Unlike some pharmaceuticals, valerian doesn’t interfere with the deepest part of the sleep cycle, called REM or dream sleep. There’s no hangover or grogginess the next day and little chance of dependency, says William Page-Echols, D.O., an assistant clinical professor of family medicine who teaches alternative medicine at the Michigan State University College of Osteopathic Medicine in East Lansing.
"There’s far less risk of building up a tolerance to valerian or becoming dependent on it," says Dr. Page-Echols. "In some cases of mild anxiety, people would do just as well taking a little valerian as opposed to a prescription drug." If you’re already taking sedatives or antidepressants, however, speak with your physician before taking valerian or trying to switch solely to the herb. Not everyone reacts to it in the same way, warns Dr. Merrell. "Valerian affects some people quite strongly. It really sedates them. For others, it’s just the opposite: They actually become agitated after taking it. In general, though the herb has few side effects."