I tend to be fairly generous with Inspiration, because if I don't I tend to forget it exists.
If a player makes me laugh, says something particularly in character, does something extra-heroic or very fool hardy, works out a clue, or makes a good suggestion about what's going on then I tend to give them Inspiration. I try to give it out to each player every couple of sessions.
What I have noticed is players forget they've got it. My group recently started to use the Heroic variant from the DMG, where you can use Inspiration AFTER you roll the dice, and roll another d20 if you've failed. Seems to work well, and make people more likely to use it. It annoys players when they get awarded Inspiration when they've still got it, but that just means they should use it more.
If a player makes me laugh, says something particularly in character, does something extra-heroic or very fool hardy, works out a clue, or makes a good suggestion about what's going on then I tend to give them Inspiration. I try to give it out to each player every couple of sessions.
What I have noticed is players forget they've got it. My group recently started to use the Heroic variant from the DMG, where you can use Inspiration AFTER you roll the dice, and roll another d20 if you've failed. Seems to work well, and make people more likely to use it. It annoys players when they get awarded Inspiration when they've still got it, but that just means they should use it more.