What is it about vacations that as soon as you are home they become a hazy memory?

My husband and I are celebrating our twentieth anniversary this year. To mark the occasion we spent several days touring and camping, just the two of us (a very rare occurrence).  We discovered we still like each other after all these years, even though he dragged me to multiple breweries and I dragged him to a fibre festival and, the following day, on a hike that took us eight hours.  It is amazing how relaxing it is to only have to manage yourself.  Excited greetings, tight hugs and… we are home.  Everything that needs to be thought about, planned for, and accomplished crash back into my psyche.  By bedtime the free spirit feeling conjured by vacationing is evaporating, leaving wispy remnants and vague sensations.  I am glad to be home, but it would be nice to bottle up that vacation feeling and be able to take a swig of it every once in a while.