 And so now you've got all this information. So what you do in the morning, you check your blood oxygen levels. Now, blood oxygen levels at night are different than in the daytime. Anything above 95 is considered normal. 95 is a cutoff. You're okay. If you get your blood oxygen levels at 95, you're fine. It usually runs from 95 to 97. If you're young and fit, you'll run from 96 to 98, somewhere around there. You'll spike into 99. Almost no one goes to 100.