Sometimes when lifting heavy (for me) weights, I'll get a bit dizzy at the conclusion of the lift. This usually happens in the later sets and the final reps, especially w/ squats. For example, doing 5x5 squats, in sets 4 and 5 I'll get a bit dizzy at the top on reps 4 and 5. The buzz goes away w/in a few seconds.
What's that all about?
Is it anything to worry about, other than the possibility I'll topple and the weights will crunch me? I'm old (61), but in excellent health.