Taking Tramadol several times a day does not produce a hangover, because every time my brain might want to start expanding to over-fill the space available inside my skull, I take another dose of a strong painkiller. Funnily enough, that stops it. But taking a single dose to relieve "omg, I hurt too much to even TRY sleeping"? Cue for a bad head the next day.
So my head is on fire & I have no ability for coherent thought. I have been posting lots of lj comments that say "Yes. That. Exactly." :)