Sleep is your number one friend. Airbeds are not - they conduct the cold from the ground straight into your body, and the heat from your body straight into the ground. If you have to sleep on one, put something hefty between you and the mattress, like a sheepskin or a rug.
Take a hot water bottle.
Take thermal pyjamas, the temperature can drop something awful.
Take a pillow.
Don't faff about with a million different hot drinks, herbal tea or hot chocolate, anything you can do in a cup without a fuss. Everything with as little fuss as possible. Pot Noodles, steaks you can throw straight on the grill (or disposable bbq), forget potatoes, roast corn instead. Stock up on those Innocent smoothie things, great in the morning when you feel like a badger's chuff.
Camping towels because they dry quickly. Flip flops for the bathroom. Your own toilet paper or baby wipes.
Take a first aid kit, annoying to not have a bit of Savlon and a plaster when you need it. Even more annoying to wake up with a banging hangover for the sake of a couple of paracetamol. Also useful, sachets of rehydration salts.
Wraps are easier to deal with than coats, just don't let it catch fire as you bend over a flame.
And a pretty dress. It's always nice to emerge from a tent looking like a princess in wellies.