Emotional lability is pretty common when recovering from a tbi.

And nightmares are pretty common when dealing with marijuana withdrawal.

Try not worry about either one. And you might want to try see if you have something around that might help you to relax when you wake up feeling anxious that you can put next to you when you sleep. (Like an old teddy bear, or a picture of a good friend, etc.)

As far as whether you are sleeping too much. My Primary Care Physician told me that I need to do what my body feels like doing. If I feel like resting, I'm supposed to rest, if I feel like I want to do something then I do it. And I think that's been some of the best advice I've gotten thus far and I've been dealing with this for about 19 months. The real trick for me was is to figure out what my body is actually telling you - I tend to push myself "too far" a lot. And considering that, it's probably better to under-do than over-do.

Much luck!