I'm no expert, but things differ from person to person. OOBEs are similar to WILDs, so you can wake up after 5 to 6 hours of sleep and try it then. It will be much quicker.
People feel many things when in SP, some feel heavy, some float so I guess it doesn't really matter what you get.
The eyes thing looks to me like Rapid Eye Movement. I'm still no expert though. If it is REM then you can't, nor shouldn't stop it, since it is the most important sleep stage (I think).

Sorry if I wasn't very helpfull.