Well, if you can't remember where you are/were, presumably that's why you need to be oriented? Wherever you are/were, the reaction looks about right. The trick is to master sleeping/despairing/weeping while appearing engaged (I'd say take a tip from your students, except many of them don't seem to bother trying to look engaged).
Also, very good practice in case you become an administrator, which means endless hours of meetings. I find writing poetry creates the appearance of thoughtful engagement. Grocery and to-do lists also work.
Just make sure you have a hankie under your face to catch the drool.