Like Kayleesgrandma said we all do desat at night because we are more relaxed, but also people who fall below 88% for a period of time do often wake up with morning headaches etc, because they are not getting enough o2 at night. 88% is the magic number for home 02, and since it was at night he may want to test you in the office with a pulse ox to see if you may need it all the time, with activity or in this case just at night.
Chuck father to Avery now 4 years old with DDF508
Chuck father to Avery now 4 years old with DDF508