Sleep late... Wake up early! Is it the receipt to be happy?

I guess I canot do that all my life but recently, I was a bit delinquant in terms of number of hours of sleeping! I went sleep late often (very) and have to wake up early to go working - on week-days. This pattern exists since few weeks now. But I saw that when I created a song the night before (sometime overnight), my tiredness is compensated with a happiness feeling that make my day more easy to accomplish. This must be the prove that if you are doing what you love to do, the life will be more easy!!!

Is it the secret of the happiness?

=:-p

DJ FYB