From: Newcastle, Australia
Yes, I've used padded leather cuffs on my girls, but there are rules - for both of us.
First and foremost, if she's gonna be sleeping with hands secured behind her, she'll be sleeping WITH me; never alone. When doing so, I sleep on my back and she snuggles in where I can be aware of any breathing difficulties. I should say here that I'm a sound sleeper in general but easily roused to abnormal sounds.
In general play using leather cuffs, I usually lock them together with small padlocks. But for sleeping, I only use a dog clip so that I'm not fumbling with keys when still half asleep, should an emergency arise. It's true that the average female is more flexible than males (certainly me, anyway) and a "clever" girl might be tempted to unhook the dog clip, if she's able. I say so here because I don't believe in nonsensical rules about a sub not being allowed to untie herslf etc in general because my girl is welcome to try all she wants - and good luck with that, I say. But sleeping is different! If she wants to give bound sleeping a go, she respects the intentional restraint limitation I impose (the dog clip).
But not every night and it's not for every sub. If she's all aches and groans etc next day, yeah, don't wanna be living with that 24/7. Main thing is she gets a good night's sleep. Both of us, actually.
Never underestimate the persuasive power of stupid people in large groups. <unknown>
Your food is for eating, not torturing. <my mum> (Errm, when I was a kid)