I'm working on my stiffness and my sleep rhythm (may have to do with the feverishness) at the moment, this week. For stiffness I've now found a new quick hack, realizing that it's the tendons: I twist both legs (and arms) outwards, then inwards, as far as they'll go, 2x4x. If I do this before getting up/moving from whatever, my stiffness is almost gone. If I do it regularly in between, I can move more smoothly. I'm hoping it will prove to increase my energy, by depleting it less.
Since I've been told I'll have to work early one day a week after the lockdown (get up at 6:20), after the initial shock and futile protest, I'm playing around with my sleeping time, napping/sleeping in the afternoons, something I haven't done for a while out of fear to make my sleep interruptions worse at night. That hasn't happened up to now tho. I've napped 20-30' twice, and slept long, 1-2h twice, no real problems yet, usually without an alarm, just listening to my body. But doing this, I've been reminded that getting up too early or being too tired had often given me this feverish-feeling long before fibro. So I'm thinking of trying to get to bed as soon as it comes, e.g. midday, instead of cold-washing it away like I've been doing up to now. Have to change a lot of my daily rhythm of work, eat & play, bit difficult, but the sleeping time seems fairly flexible, sometimes it was at 1 (shorter), sometimes at 4 (longer).