Grimrock

I rested on top of the spire, killed an ice elemental that woke me up, rested again. Now I am one level below the spire on top of a replica. And I have no idea how to get back. Resting on top of the spire does nothing, neither does casting the Dispel spell and I can't find any other way to get out.

You just need to wait a while on top of the spire. It's not actually required to rest, although it does make time go somewhat faster.