Wake up after a certain amount of sleep

I have what on the surface seems like a simple problem. I want my Apple Watch to wake me up after I've gotten let's say 7 hours of sleep. This isn't a currently supported feature even with iOS 16 + watchOS 9. Implementing it would require access to the current Sleep State aka Sleep Data in real-time.

So then I am trying to write an app to wake myself up after I've been asleep for a certain amount of time. Is sleep data available in real-time, or can I access the current 'live' sleep state, or is sleep analysis only done in post after I've woken up for the day? If sleep analysis is only done in post, then it's a chicken and egg problem.

I understand there may be some legal implications that the apple watch sleep data doesn't guarantee accuracy, so the app would be reacting to potentially inaccurate data at the user's risk. If I accept the limitations and the risks, it should be fine if I make this app for my own personal use only.

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CodeWarrior
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Sleep is a publicly readable and writable data type so it depends on the implementation of a given application that writes data. The built in sleep app writes Sleep data at the end of the night as you've seen. Other apps may choose to behave differently depending on their sleep algorithm implementations. I hope that answers your question.

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jcafaro
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  • Yeah, that's what I thought. The 'built-in' sleep data doesn't exist until after waking up for the day, which is useless in developing this feature. It requires Apple to do a complete rewrite of the underlying core to support 'live' or 'real-time' sleep info as the night progresses and as sleep is occurring to support, for example, 'wake me up after getting 7 hours of sleep'. The development effort to support this would be at least several months, in the current backlog at least a year out.

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    CodeWarrior
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