I've been on Ritalin for years for (unipolar) depression. I take the long acting (LA) version. It helps a lot and I can feel when it wears off in the late afternoon. The immediate release was a bit rough on me but this one I had a little bit difficulty in the beginning with heart racing in the AM. That leveled out fairly quickly.

It does not ruin my sleeping but then again I have hypersomnia, so that's not surprising. I do have issues if I stop taking Ritalin abruptly. Always need to taper down carefully if taking a break. If I stop I get absolutely terrible rebound-depression.

It does not take my depression away (and fails when things get really rough) but it has a definite positive effect that antidepressants alone do not seem to have on me - and I do not have side-effects from it.