Day dreaming is a great way to want more than you have and therefore is motivation for negative change.

Daydreams are the analog way to release serotonin, now we scroll through social media, either way the lesson is the same.  If we spend too much time focused on that which we are very unlikely to have, we become far more likely to ruin what we do have for the extremely low chance we will get what we want.  That is why day dreaming can only lead down a dark path, instead spend time appreciating what you do have, others have it far worse!