It helps to have a good understanding on how the AF works.
Most all SLRs use contrast based auto focus. It needs light, but
it also needs an area of high contrast.
In lower light particularly, it can help to have the particular AF
point over the highest contrast part of the scene (or something at
an equivalent distance away from what you are shooting)
So in low light, look for hard edges and focus on them. A white shirt against a dark jacket, that sort of thing. Light bulbs at the right distance. The edge of the head and the background.
Whatever is at the right distance (or roughly right, depending on your depth of field) and has high contrast. Your camera will thank you for it.
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