I doubt it would have lasted 3 months. You would have started sleeping longer again. The reason it is so easy on a vacation is because it is so different from the demands of earning a living. You've got a whole new routine. You were outdoors and I'll bet you work indoors. There were also less stresses like getting stuck in traffic, making sure you get your report in on time. So you were more in the here and now while on vacation,
If you want to find the energy you had while on vacation you'll have to look at adding more adventure to your daily routine. Have more BBQs, do more outside in the morning before you go to work. Make sure you have more variety in your day. Once you've decided what habits you might need to build the ethusiasum for being more in the now moment use the New Behaviour Generator.
Alex