I don't know about aspirin, but ibuprofen has been reported to affect dreams. I wouldn't take it just for that, however.
Right. Ibuprofen can be hard on the kidneys if you take too much of it too often. At least I think that's the case.
But if one needs to take a large dose of it for some other reason, might be good to combine it with SSILD, or other induction methods.
Really only two things you need to worry about with ibuprofen - if you have kidney disease or congestive heart failure, DON'T TAKE IT!
And, take with milk or some food as can be hard on the stomach.
400mg dose is not considered a problem. Once a day (or night) is nothing - can take even 800mg 3x/day, but not really recommended for long periods of time unless you have arthritis...
I took 400mg last night with my small bit of peanut butter and square of Lindt chili chocolate!