I definitely agree with this! It seems that brain fog IS related to poor sleep or lack of sleep. Sometimes pain is greater then too.
Also, just found out that your blood pressure can be raised due to pain. That's why mine was GREAT today (I wasn't in much pain) but is borderline high when I'm in pain. Just a thought for the rest of you to consider...
Oh yes... I really do. If I am the slightest bit active I have to have a sleep in the afternoon for a couple of hours. But that depends again also on the insomnia cycle so it does catch up eventually. They thought I had CFS before my diagnosis but I'm sure I have both. They are very similar but I do have the sore throat etc of chronic fatigue.