1. How often do you do it?
2. Where do you usually daydream? (In class, at work, while walking/driving/riding, ...)
3. Is it usually about the future, or present/past also?
4. What is it usually about? (You, your SO, people you find attractive, ...)
5. Do you daydream about impossible things, or rather something that could potentially happen?
6. Is it upsetting to you when some of your daydreams don't come true? (If you're thinking of possible events.)
7. Why do you do it? (To fall asleep, put yourself in a better mood, ...)
The more details, the better!