Jojo getting sick?

Almost a good, typical weekend except that now we think Jojo is coming down with something. He started being very quiet and requiring a lot of oral suctioning (about every 2 to 3 minutes!) at 4PM. His O2 sat level and HR were normal for him. No fever. He did say that his throat hurt but not bad. This evening/tonight, he remained quiet and looked tired, but he still wanted to play computer and watch his DVD. When his Daddy got home, he told him that his throat hurt bad. He was asleep by 9:30. Definitely something is going on with him. There has been so much illnesses (bad cold, cough, etc) around us (especially at work). I really thought that we got lucky and skipped being sick. The last time he was acting like this was in December. We stayed in the hospital for 2 days; we probably did not need to go but we just wanted to make sure. Well, we're just going to have to watch him closely.