Maladaptive Daydreaming is not an officially recognized condition yet.
We’re still learning a lot about it.
Here are some of the main symptoms that seem to be emerging:

• You daydream more often than you think is normal.
• You’ve built up a character(s) that’s an idealized version of yourself
• You feel more empowered in your daydreams.
• You’re starting to enjoy daydreaming better than the real world.
• Daydreaming is starting to interfere with your day-to-day activities.
• You might enact some movement, like pacing or moving your hands, (though not everyone does this).
• Some people make facial expressions, talk, and/or act out their daydreams.  

You can also find a more extensive document that can be useful to have a better understanding; it comes from Professor Eli Somer.

https://somer.co.il/images/docs/2016_MDS.pdf

This is NOT A TEST, is an assessment tool used by clinicians.