This video shows how I perform the Hip Bump Sweep. This is a very basic sweep and a very high percentage sweep all through the ranks of BJJ and even into MMA.
There are many different schools that show how to do this and there are a lot of acceptable variations. In this video I show a way to swing your arms up around your head and come up off of your ribs, elbow and hand. When you come at this angle it is very difficult for your opponent to stuff the sweep while also being very comfortable to do (as opposed to sitting up directly). I find that this will be a much easier variation when you're extremely tired.