As soon as I start Lion's Mane, my productivity decreases. I don't feel bad (at least right now), but I procrastinate all the time. Mood is quite good also, and I'd like to get outside and work in the garden or go biking, so, no fatigue. AFAICT, Lion's Mane is the only difference today.
I observed the same thing last week, where I had a few days of getting virtually nothing done, which improved dramatically when I stopped Lion's Mane.

Does anybody have an idea how I could increase motivation on such days?

That happened to me also, I was mostly doing STEM before starting the protocol and then I found that I had a mental block of sorts,  this can happen with CFS but the timing makes me think it was to do with the protocol. I think it is brain inflammation which is expected for removing the viruses !  at some times I was a little delirious too.  Its a shame but I think its worth it for the chance of an effective treatment. 

That happened to me also, I was mostly doing STEM before starting the protocol and then I found that I had a mental block of sorts,  this can happen with CFS but the timing makes me think it was to do with the protocol. I think it is brain inflammation which is expected for removing the viruses !  at some times I was a little delirious too.  Its a shame but I think its worth it for the chance of an effective treatment.

Yeah exactly, it's like a mental block. In the meantime it did get better, and I hope that eventually I can do Lion's Mane every day without any issues of this kind