Sleep tracking with Apple Watch on iPhone 14 pro

I can not get consistent data on sleep. I have NO sleep schedule and can’t set one. Sleeping is the ISSUE. I would love to get the data, as I wear my watch all night long for that purpose. I would like to find out what is happening when I sleep. I turn on “sleep focus” and get zero data. Sometimes, it is only for the next day, as I am awake all the night.