They do, it's called the Apple Watch. I find if I charge it in the morning and night while I'm brushing my teeth, the battery lasts all day. And there's a few a

They do, it's called the Apple Watch. I find if I charge it in the morning and night while I'm brushing my teeth, the battery lasts all day. And there's a few apps that do good sleep reporting. I like AutoSleep and SleepWatch