I have similar problems with my mind wandering off and falling asleep. I usualy try RC’s all day and then MILD/Autosuggestion helps alot. Also if you click the smilies in my signature, there’s a link to my technique 
As far as the reality. It will vary. Sometimes its very realistic and vivid, others its similar to a dream. From people I’ve talked to, it seems that normaly the first LD has a bit of a ND feeling, but like I said, it varies.
PS- 
to LD4all 
Be sure to introduce yourself in The Big “Hi, I’m New Here!” Topic. I’m sure there are many people waiting to welcome you. 