I have a insomnia triggered by medication where I cant sleep at night, had it all my life its got better with age and less meds but still happens sometimes (mainly in winter with SAD).
I had it before kids and now with kids, its not remotely 'self inflicted'.
I also suffer fatigue (not sleepiness but tiredness as in no energy to move/do things) from my disability (cerebal palsy), once again all my life (before and after kids) and again not self inflicted. Seemingly my disability is 'invisible' to most even though I drag my foot and occasionally spasm so people don't tend to think of me as disabled but trust me everything takes 100% effort even trying to make my hand close to hold something which is 'tiring'.
I am also a carer, back when I was a live in carer (before having kids so not now) I regularly got woken up by patients multiple times a night... from them wandering around lost (demetia patient), peeing on thing (autistic), falling out of bed and hurting themselves (another demetia patient) or one who use to like to climb in with me for a 'cuddle' (creepy when hes 32 and your 17, he was harmless/non sexual though he had the mentality of a toddler).
Some parents aren't tired (honestly after about 6 weeks old I have had very little night problems from my 3, only when they're sick), some child free people might be (for a whole host of reasons)... both sides need to have more awareness and treat it like its not a competition.