I have not been diagnosed primary HPT yet. I was diagnosed with secondary HPT 2-1/2 years ago. I still think I do have primary, and I am hoping it will be diagnosed very soon. I do, however, have most of the symptoms, including severe chronic muscle cramps, joint pain, tendon pain, and bone pain. I would have to say that my symptoms are usually worse at night. There are some days when it doesn't seem to matter what time of the day or night it is, but usually they are worse at night.
I also wake up with horrible depression episodes. It's like every awful thing I can possibly think of runs through my mind, causing my chest to burn and making me feel like the world is coming to an end! These episodes only last a minute or 2, and then they pass, but they happen very often. Considering I wake up many, many times a night, and these happen when I wake up, I have quite a few of them. I don't have them every time I wake up though, thank goodness! I never realized these episodes could be a symptom of the HPT. I keep learning more and more on this forum. Again, so happy I found it!