Nap. Take the travel pillow provided for you on the plane--God bless Lufthansa airlines--and find a dark empty corner. I wrapped a shirt around my eyes to block out the light, made sure all my bags were touching me, and sprawled out across 4-5 chairs. Frankfurt airport has a great set up for this, comfy chairs with no arm rests. I napped for 3 hours. Take the time to clean up with some baby wipes. Feel refreshed and smell good. Apply a little mascara even, so you don't look as half-dead as you feel. Read. Read something simple, but either entertaining or thought provoking. Wander through bookstores and resist the urge to buy. Yes, I know you have wanted to read Dharma Bums by Jack Kerouac, and yes, Nelson Mandela's autobiography would be perfect, but you have five books, two journals, your bible, and a sketchbook. You are going to be all right. (My self talk...) Write. Listen to people speak German all around you and get excited when you understand something...