I lost the sleep app on my apple SE watch (11.1) : iPhone 15 (18.1)

I managed to reload the sleep app, however going into the watch app on the phone and clicking on Sleep there is a bottom line stating “Don’t Use This Watch for Sleep” in red. There are no adequate explanations for the effects of clicking “Turn off”, only the results. What harm is possible doing this? losing the history ?or the sleep app not working .

That apart from that the sleep app is now recording data ok

Thank you