Name that Sequence!

Can you identify, name, explain, or predict the next element of the following sequences?

• 1, 2, 3, 2 or 4, 1, 2, 3, 4, 2, 1, 2, 3, 4, 3 or 5, 2, 3, 4, 5, 3, 2, ...

I give up, show me the solution.