That's a great question. I love getting high during the day. It's something about the sun, perhaps the opposite of Goodman3eb's preference. I tend to feel a bit depressed when I'm stoned at night and in the wee hours. The darkness tends to zap the fun; it takes the enjoyable, light part of being high and replaces it with a lead-weight feeling. More like a trance. In contrast, when I get stoned and sit outside, I feel like I'm in tune with everything, and I feel the breeze or heat, and I'm very, very happy.