I once did exactly the same. I was in a hot room (hot summer day) and I was doing dry statics in a sitting position. There was nothing else unusual. I took a full breath with no packing. I got an immediate feeling of having overpacked (too much pressure in lungs, spaced out feeling), but ignored it and continued. After less than 30 seconds, I blacked out, and found myself in the same position afterwards, breathing normally.
I think it was caused by the hot environment and sitting position. I have never blacked out after such a short time in any other conditions. I am not prone to packing blackouts, hyperventilation blackouts, or anything else which could cause blackout at the beginning of a static.
Lucia
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