Another one here who always experienced the sugar high, followed by the crash. It was a constant roller coaster, extreme high followed by an extreme drop.

Can't concentrate? Groggy? Irritable? Have some sugar - you'll feel better, perk up, and think clearly for a while, before your blood sugar crashes and you're irritable, can't think clearly, and feel like you're going to nod off again, which means it's time for more sugar.