What beverages do your characters use as part of their wind down routine? Is there a fictional equivalent of Horlicks?! What happens when your character's life is turned upside down with the likelihood there will be no relaxation time for the foreseeable future (and indeed they will do well to even survive)?
How do your characters recharge their batteries? How do those they might help them get through their quest make sure they're not too tired to do the job?