Why does vacation make me sleep so much?

I've always thought it would be lovely to drink coffee on a porch in the spring whist staying at a log cabin and reading for an hour before anyone wakes up.  Alas, my body betrayed me and I slept until the noise level was too much too bare.  I guess dreams take effort, initiative and an alarm.  

Two days at a cabin in the woods.  Not one photo taken because we were so busy having fun that I forgot to dig it out. We painted rocks, wooden masks and I got to work on an embroidery project.  It was quite a crafty good time pared with amazing food.  No wonder we were tired and sleeping in.  But next time, I hope to make an effort to get up early for one hour of "me" time.