After 31 years with MD, this is how I spend most of my daydreams and most of my life. I'm constantly going in and out of daydream throughout the day. Daydreaming on its own isn't enough to keep my attention. I'm always daydreaming while doing things.
I do this too. Though sometimes when I'm having a conversation with someone, I have to get them to repeat it. I always feel so bad when that happens since it usually results in them asking me if I was even listening to them. But I can't help it. It's been this way for so many years.