I'm not sure about plasma because I'm not a donor; I only know how much you can make in this area from coworkers who donate twice a week.
Back when I used to donate platelets, I definitely noticed that I wasn't able to work out as hard and became fatigued more easily for a day or two afterward. I would usually eat a lot of beans and nuts, drink lots of water, and take a multi-vitamin right after my donation to help replenish my lost platelets. It's likely something similar for blood plasma: lots of water, protein, iron/zinc/copper.
I have the same problem, and often wake up unexpectedly in the middle of the night. Sometimes I can fall back asleep quickly, sometimes I am up for a couple hours, occasionally I won't get back to sleep at all. Whenever it happens it ruins my energy and mood the following day. It started to impact my energy level to where I couldn't exercise the way I used to. I'd become fatigued so easily that I could barely make it through my routine. Sometimes I wake up with my joints and muscles feeling so sore that I could swear I was beaten with a stick while sleeping. I started gaining a lot of weight despite no changes to my diet. My mood and brain fog were the worse they've ever been. I had maybe one "good" day every month or so.
A coworker and I were sharing our gripes about getting older, and I mentioned my sleep problems and the impact to my quality of life. They had gone through the same thing years ago, and ended up being diagnosed with severe sleep apnea; they recommended I get tested for sleep apnea, too. I talked to my doctor and scheduled a sleep study; turns out I also have severe sleep apnea.
If you have any of the sleep problems like me, then I recommend you talk to your doctor about it. Here's a few things to keep in mind: