Hi, KDD . . . it has been my personal experience that sinus problems, congestion in the chest and ear pressure get worse at night because of the change in barometric pressure from day to night. I got onto this line of reasoning after having a particularly bad asthma attack years ago and the emergency room physician (a grandfatherly type) told me to avoid "the night air" because it would make it worse.
In doing some research on my own, that is what I have pieced together and it seems to hold true, for me at least.
If you are worried about Ibuprofen, you might want to take an Acetominophen (not so many side effects and up to 2,000 milligrams spread out over a day is not toxic according to my doctors).
Feel better soon!