It is exhausting and that's why you need to pace and rest when your body tells you too.
For restless legs have you tried drinking tonic water (the one with added quinine) as it can help. I sympathise, I share the same condition.. I find things like a weighted blanket helps, as do things like a hot water bottle, and fluffy socks - now I've painted a beautiful picture of me at nightime lol... Codeine has never helped my RL, but I now take cbd oil which helps too - some of these work, some on their own, some in conjunction with each other and some nights I've tried everything and it still doesn't help...