We went to bed at 10 and DH conked out immediately. Since then, I've spent an hour and a half or more in and out with one or other of our DDs. Toddler is too hot, needs water, doesn't have a favourite toy, had a bad dream about a fox, etc. Baby is a baby, needs fed, rolled over and got her arm stuck, etc. Every time I get back into bed and drift off, someone cries for me.
DH has slept through all of it. Not even a slight change in his breathing. Fast asleep. Fucking how!? I wake up if one of the girls so much as coughs!
Before there's a pile on, I'll wake him myself if I need help and he'll get straight up. I just don't get how he sleeps through the crying. It's like a blooming alarm by my ear!