>>56058296Nah, you get very few of them for free, and it only doubles the dream shards received from research.
Whilst it'll be easier to get higher value sleep styles on a good sleep event night, the best use case for luck or focus incense is guaranteed legendary encounters as they award far more dream shards/research EXP than most other Pokémon, particularly if you know you have a shot at a 2 or 3 star legendary sleep style.
Pic related is a huge payout I got from a 3* Entei encounter with luck incense.
Best incense to use on good sleep event is growth incense that doubles sleep EXP earned.
As you get few of these, save them for the night of the full moon itself which awards 2x event EXP, rather than just 1.5x.
Make sure you pick Pokémon that really deserve the EXP. Whilst putting in Pokémon with Sleep EXP Bonus is tempting, this can actually mean putting less EXP into helpers that matter.
E.g. 5x200 EXP earned versus 4x234 EXP earned.