How many hours of sleep do your kids get?

[adi&co.]

I'm plagued with days on end of barely any sleep because of the combination of my terrible sleeping habits and my kids' wonky ones. I was thinking about my oldest, Marcus. He's 6.5 and only gets 9 hours of sleep and that's after we started him on melatonin to get him to sleep earlier. he goes to sleep around 9 and wakes up at 6 and when he wakes up, he wakes us all up (drives me nuts since I don't sleep much at night)

Jamesen goes to bed around 9 and will sleep in until 9 if Marcus doesn't wake him up (he's 4). Gemma goes to sleep around 9 as well and will sleep until about 8 if Marcus doens't wake her up, but she also wakes up at least 3 times a night (still at almost two, ugh).

is this crappy sleeping a normal thing? Can you tell me how many hours of sleep your kids get and their ages?