Jetlag Level 0: Normal amount of incompetence.
Jetlag Level 1: Forgetting things, but remembering you have forgotten them.
Jetlag Level 2: Forgetting things and not noticing. Or caring.
Jetlag Level 3: Inability to do two things (such as walk and talk) at the same time.
Jetlag Level 4: Inability to one thing at the same time.
Jetlag Level 5: Staring at the PUSH sign on a door and not understanding its relevance to the problem that the door won’t pull open.
Jetlag Level 6: Can only recognise and use the simplest of things. Namely, a bed.