I've been handing out between 1-3 inspiration per session. ( Total, not per character. ) But, my players keep forgetting to use it. ( And the have a big, shiny, glimmering GO chip in front of them. It should be hard to forget to use it. ) I'm running them through PotA right now, and each character had a dream about it between the last session of LMoP and the first of PotA. I used the Adventure Hooks as the basis for each character's dream, and will be handing out inspiration based on the locations or NPCs they saw in dream.