I had LASIK done about 5 years ago, and I also happen to be a tech for an ophthalmologist.
You cannot wear your contacts up to the day of your procedure. If you wear gas perms, you will have to be out of them for weeks, possibly months, before your procedure. Contacts, even disposables, reshape the cornea to some extent. Your corneas need to be completely back to their original curvature before LASIK is done.
You don't necessarily have to "sleep" when you get home. It's highly recommended that you "rest" your eyes for awhile(a few hours would be ideal) and close your lids. Your corneas are one of the fastest healing parts of your body. An abrasion can easily heal over in 24 hours. Closing your eyes just helps the process.
Maybe it was because of my work, but I wasn't the least bit apprehensive. I felt nothing, and the thing that keeps your lids open wasn't bothersome to me at all. Not comfy, but not bothersome really either.
I think the only thing that really bothered me was the thought have having to hold my eye still and stare at the red light for several seconds. As a PP stated, i was nervous I would glance away. Believe me, though, that these machines are highly detailed computers. I am pretty sure they compensate for small things like that(to an extent anyway, but this is just a guess).
After it was done, it looked as though I was looking thru Vaseline(which is what I expected). Patients we see now after LASIK say that they could see clearly right away. I work for a small practice, and though the Doctor I work for has done this for several years, her practice is not one of those laser vision centers that pump patients in and out by the higher numbers.
Anyway, I did go home and try to take a nap for a couple hours, but had a hard time sleeping. I ended up laying on the couch and resting my eyes when I could. I also went back to work and saw patients the following day with no problem(and no glasses or contacts!!!!

) It took me a few weeks to get my best vision, but I had quite a bit of nearsightedness. The Lasers today have come quite a ways recently and are much more advanced than the one used on me.
I actually never experienced any pain. I did have some dryness and scratchiness, but not much and I just used the artificial tears for that.
For most people Lasik is a very easy process. Actually, I've never seen a patient of ours have ANY trouble after the LASIK. PRK(which did precede LASIK, but is a different procedure) can be a different story, and I've had fellow employees who had it when it was brand new.
Good luck with your procedure. You'll walk out feeling like it was a piece of cake, and you'll be able to see the alarm clock in the morning!!
Also, I do still see starbursts around headlights, and I opt to wear a very minimal prescription for night driving to help that. I don't need them, but they do help(when I remember to wear them

).