why ask why

for no apparent reason, after months of feeling apathetic and low on energy, for the past few weeks I've found myself feeling deep and abiding contentment and acceptance of What Is. 

the situations and dynamics that my mind had been chewing on before I was even totally awake for many mornings in a row have not changed, but now I am awakening peacefully, listening to the birds and squirrels chatter instead of my own thoughts.

to what do I owe this grace?