I'm really worried about my father. About ten days ago, he had a fever, but thankfully, it's been gone for the last five days. However, his SpO2 levels are really concerningthey drop to around 52-55 when he's sleeping and are only 85-92 while he's awake, no matter whether it's day or night. He's been snoring for years now. He weighs about 90 kg. His HRCT done on May 7th showed a score of 1125. He doesn't have any other symptoms like coughing, headache, body pain, or loss of taste or smell. Currently, he's taking Megmacer 1gm, Pdsolon 40, Alcorab 20, and Megclid. What should I do?