Restless leg syndrome is an annoying problem without any known serious consequences, says the Mayo Clinic (paraphrased by me). I am a physician with many (many) years of experience. I don't think our bodies do annoying and miserable things to us without reason, and if you can find the reason you can fix it. of course that's easier said than done. RLS seems to be a problem with the reactivity of the muscles to miscues from the nerves down there. Some theories have been proposed about various hormone or nutrient imbalances but no real answers, so lets look at it from the legs' point of view. Legs are made to move, and by that to move us. They are pretty much specialized for moving. Built into their particular movement process are things like how they get their energy, what their relationship with the nerves is and how they get rid of the leftovers and waste products from the muscle work of moving. That's a long story, as told by scientists. Here's how I look at it, what are your legs trying to tell you?
First you tell us you had the flu. That would imply that you were out of commision for a while. Also that your immune system (the illness fighter) was working really hard that whole time. That means using up resources. So now you have legs that haven't been doing much of their intended job lately and that some of their resources may be low or unavailable. Two of the things muscles need most to stay healthy are regular use and good blood flow.
SO my recommendations: give them what they need.
1. If you have been less mobile that usual, start preparing the legs for resting by working them more. Walking, pacing, dancing, marching in place, moving you feet and legs up and down wihile watching TV - anything to get them moving again. Think of it as telling your legs they are still loved and needed, an quit complaining and whining at night.
2. Pamper them so they will forgive you for not using them. Hot baths for soothing soaks. Massage, especially the big muscle groups like thighs and calf. Eat their favorite meals. Those would include lots of iron, proteins, calcium (needed for muscle contraction) and magnesium (necessary for muscle relaxation).
3. Give them lots of O2 (oxygen). Do some deep breathing before bed. Slow, deep, breaths so you don't get dizzy, and think the oxygen into your blood and down to those unhappy legs. Sounds silly? don't knock it till you've tried it!
I’m happy to help further over the phone at https://www.6ya.com/expert/betsy_0a20bad2d178c082