My children are now 10yo & 12yo. They were both (for different reasons not the best sleepers) but in the last 2 weeks I have been reminded of what the impact of less than ideal sleep (for me) has. I can sort of compare what "normal" feels like compared to broken in a very different way & it brought back lots of memories, so while it may be outside your questionaire range I thought it might be interesting.
So background I have been a "tour parent" for 12 girls on a 12 night tour overseas. We had a busy program & aimed for the 10-12yo boys & girls to go to bed around 8.30/9pm & up around 6.30/7 depending on training times as it was a track & field Athletics tour. So they were getting around 10 hours sleep IF (not often happened) we weren't running late & they weren't unsettled by another child in the group. So by the time we got them settled around 10/10.30 & then we sorted ourselves for the night (& often needed to unwind with other adults in the Rec room) we made it to bed around midnight & up again at 6am to be showered & ready before the children were up... so 6hours was a "normal" night (I normally get 8 hours) then of course it was an open dorm so children talking in their sleep even falling out of bed, getting up to go to the toilet it was broken sleep. I have a fit bit, so I know the wake periods etc & it was very different to my normal patterns.
I found 1) I was far more emotional about things 2) I got even more frustrated by noise (I'm noise sensitive anyway) 3) I was tired - exhausted to the point of tears sometimes, but I couldn't get to sleep & need a LONG time to wind down even though I wanted to sleep 5) food choices were different, I looked for food that would give me a pick up rather than being hungry.
This brought back memories of when my boys were babies/toddlers & while I loved them, all I looked forward to was when I could have a nap or go to bed. I spent lots of time waiting wishing for the next time i could get some sleep.
I also today notice that I feel a whole host of emotions over things that I just normally get on with without a thought, like I have to make a phone call to sort out a problem - it makes me cranky I have to do that - extra cranky & I fear I will get angry when I do, I'm dreading having to go get groceries because the environment will be too over stimulating & I will feel stressed by it.
Overall this is 12 nights with around 6 hours of sleep & on average 2 wakings a night & I've got to that point... looking back on my journals when my boys were little - DS1 fed every 2.5 hours & a feed lasted 1 hour, by 3 months it was more like 3.5hours & 30mins & he had night wakings on off until 4yo... DS2 fed every 3-4 hours & took 20-30mins & that was noticeably better, but if I had 2 nights of teething where I got say 4 hours of broken sleep I was worried about driving a car etc.