I had the same experience this morning! But, I knew better to not snug up my gloves, because I have serious carpel tunnel that gives me trouble with any kind of intense hand work. (Painting, riding, writing....) My new road bike is giving my right hand fits, even though I can move them around on the bars, unlike my mtb.

This morning I realized I had tightened that glove down snug, though. DOH! I know it's not just that, though, because I've been having numbness at night a lot lately. I came home and took some B vitamins and that should fix it up.

Karen