In your bedroom, next to your pillow. It couldn't be any more perfect!
Yes, @dswigle, I fall asleep dreaming of a field full of lavender... I'd like that but it doesn't happen very often. Anyway, the scent of lavender is very pleasant and relaxing. It reminds me of the flowers my grandmother used to put in my bedroom, it was called "sulfine" (Melilotus officinalis), I don't know if I'll find a translation...