What preceded this event -- did you participate in anything stressful (good
or bad stress can cause me to drop low)? Also, how
old was your insulin -- if you use a long
-lasting insulin like Lantus, if it is older than 1 month old, it can misbehave. I notice that I get "dumps" of insulin and will drop low during its peak time at about 4 hours after injection, or at about 5-6 pm, when I think its crystals just give up the ghost and cease to release slowly when my insulin is old.