It’s interesting to note when one goes on vacation, the level of energy is always high and charged up even though sleep is insufficient and complete rest is lacking during the whole time. The minute one gets home, a sense of the oncoming familiarity kicks in with the thought of an uninterrupted sleep ahead yet the energy is sapped.
I guess when the vacation is over and faced with going back to work, responsibilities and routine, the enthusiasm is at a different level. No wonder people always say another vacation is needed to recover from the just concluded one.
Angieneering 
Remarks