I can sleep for 7-8 hours at night (with loo breaks and waking up each time I turn over, obvs) and still be knackered by 10am.
I'm 40, have a 5-y-o, but she's at school and I've just started my maternity leave (I'm self employed). Taking iron after bloods showed I had low hemoglobin etc. But I'm just so tired. Napping most days.
I realise this is a luxury a lot of women don't have. Pregnant mums with pre-schoolers, I take my hat off to you.