>>People say that Wellbutrin can affect people quickly,

The side effects can occur quickly but it still takes a little time for the antidepressant effects to kick in, just like most antidepressants. Wellbutrin was the first med that I found effective, I noticed after several weeks that the depression was starting to lift. The "activating" effects did occur quickly though... it keeps me awake if I take it too late in the afternoon so I have to be sure to take my dose early.

>>or if it's the "libido enhancement" that so many people talk about with Wellbutrin.

I'm not sure that Wellbutrin does that... what one of the things that makes it very different is that it doesn't have the libido supressing/sexual disfunction side effects that many other antidepressants have. When I took it all of those side effects went away. After being on other meds for so long I would say that it felt like "libido enhancement" just by comparison. I am now on something in addition to the Wellbutrin and it does have a sexual side effect, but it isn't as bad as I have been.

I say follow Fayerody's advice, stick with it until the antidepressant effects have a chance to work and see if it helps. If the effect on your sleep persists badly talk to your pdoc, same if any of the other side effects are too bothersome, effecting your work, etc. He may prescribe a sleep med to help or may want to switch you to something else.

IMO it is always the best thing to stick with a drug for awhile before ruling it out... otherwise you may miss out on something really effective for you. The exception is severe side effects which you should always report immediately to your doctor.