My DP naps in the day. He does have a stressful (though not manual) job but I am amazed at how much he needs to sleep. He is often in bed by 8.30 and gets about ten hours sleep a night.
I always get annoyed when he tells people that the days of getting a lot of sleep are over as he has young children because their existence doesn't really have much impact on his sleep.
I bf my two DC so got up in the night with them several times in their first years. I didn't ask him to get up, I didn't mind but it did piss me off when he complained of tiredness.
I am up with my DC at 6 every day and because he stays in bed at weekends, I always take him up a tea if he hasn't surfaced by 9 and usually have to hurry him to get up if the DC's fighting/demands are doing my head in after 3 hours. He takes his time getting up.
This morning he did get up early with me ( I told him I didn't want him missing the present opening) but when I turned round a little later he was dozing on the sofa.
Like other OP have said he often takes himself off for a nap when one of the DC is napping.
He's always been a big sleeper.In all other respects he's a decent guy but I do find myself resenting his need to nap so much. It's not that I want to nap but I'd like us to be a team at weekends as I'm spending time looking after the kids on my own in the week and would like some company/help.
I know some people need more sleep than others and if I told him I needed a lie-in, he would offer to entertain the kids. But the truth is I'd rather get up with my kids and play with them (and get my sleep in as they get older) but I don't necessarily want to do it on my own all the time. It's a very lonely place to be.