What causes low blood oxygen levels at night?

Rapid breathing Narrowed blood vessels, preventing sufficient oxygen reaching vital organs Fluids can accumulate in the lungs Possible chest pains when breathing in deeply Abnormal gas exchange in the lungs

https://www.terrycralle.com/increase-oxygen-levels-while-sleeping/

What are the dangers of low oxygen?

when retaining excessive fluid when airways are tight and wheezy with respiratory illness, or advancing lung disease sleep apnea about 3:00am when you wake gasping for air with activity when the heart muscle has become weak while bending over or kneeling down sudden onset of Heart Failure

https://www.verywellhealth.com/covid-19-happy-hypoxia-oxygen-levels-5090027

What are the symptoms of not enough oxygen?

What are the symptoms of not enough oxygen in the blood? Shortness of breath Tiredness Cough Bluish color in the skin, fingernails. and lips Confusion Sense of euphoria Sweating Rapid breathing Wheezing Lack of coordination More items...

https://www.webmd.com/asthma/guide/hypoxia-hypoxemia

How nighttime oxygen might save your life?

How Nighttime Oxygen Might Save Your Life. 1stclassmed.com Normal oxygen levels are generally between 99% and 95% during waking hours. During the night your oxygen levels naturally drop because you don’t breathe as deeply while sleeping. Your oxygen saturation levels should ideally remain above 90%.

https://www.oxygenmag.com/life/5-tests-save-life-9919/