Seriously, it's nothing to do with the parenting at all, I promise. They haven't found some secret spell for getting their baby to sleep and stay asleep.
I'll be honest, I find the toddler years far harder than the tiny baby months - DS2 is 2 1/2 and wakes maybe once a night now, or comes into bed with us, which is absolutely fine, but it's the bedtime battles trying to GET him to sleep that wear me down.
Although last night, I was lying down with him, Ds1 was already sound asleep and I could hear DS2's breathing getting slower and more "snorey" and I thought "thank fuck, my beer is downstairs and is getting warmer by the second..." and just as I'm about to get up, he takes a deep breath and I hear "tinkle tinkle little tarrrrr, ow I wanna wah ooo aarrrhhh...mama SING!"
So although the lack of sleep is exceptionally frustrating and I frequently refer to my 2 boys as dickbags a lot of the time (not to their faces obviously), they're fucking cute when they know you're about to jump off a cliff and they need to reel you back in.