I have also seen some recent articles that on top of the weakened field, the recent increase in solar activity, CME's create electromagnetic disturbances which could interfere with the brains biological electrical system, potentially affecting our mood and cognitive function, as well as messing up our circadian rhythyms.
And I also read it may effect neurotransmitter production and hormone levels.
I have personally been waking up a lot lately between 3 and 4 with a crazy amount of energy, and unable to go back to sleep. It is very uncommon for me to not sleep through the night.