B.D.
Maybe hubby is feeling a little neglected? I don't wanna assume, but we ladies are the same way right?
I know that if I have a problem and my husband doesn't ask me what is wrong I get even more upset that he didn't notice. Ha ha!! We're a little nutty aren't we ladies?
But this might be the case for him too. We all need attention and the feeling of acceptance. As I said, I might be off base here... but ask him what is bothering him. It might help.
Now, on the physical end of it. Try turning down the lights of your house as the day gets darker. It will help release melatonin in his body. Bring down the stimulation in the house... turning off the TV or turning it down.
I know this might sound a little kinky... but have you tried sex? Most men do fall asleep after sex, mostly because it takes so much energy out of them, and clears their minds too. Not to mention, you get something out of it and it will increase your intimacy.
Try the natural things before going the pill route.
Good luck my friend and let us know what happened.
~B