what do you think about when you meditate?

[Jeremy]

I usually try to work myself into the thoughtless state but a recurring problem is that as soon as strong visuals suddenly show up with great clarity; I go 'wow!' and poof, I have to start over again.

This is a typical thing which will work itself out eventually with consistent meditation, though.

Hah I have the exact problem. As soon as I enter a deeper state by either experiencing visuals or that vertigo feeling where my chakras are balancing themselves, I can't hold it for very long as my mind and body kinda jump and it sends a shock through me kinda like when you catch yourself falling asleep when you weren't meaning to. The difference though is that it happens when I'm not even close to actually falling asleep.