Ask HN: Does sugar intake help with stroke symptoms?

So about 5 years ago, someone I knew had a stroke, and incidentally, as soon as we administered a sugar liquid, he came into his senses and we were able to prevent any permanent and lasting damage to his brain. The doctor said that he suffered an Ischemic stroke.

Coming back to today, he started showing symptoms of stroke again after all these years - difficulty maintaining balance or comprehending the surroundings. We quickly gave him a glass of sugared water and a spoon of sugar and he was again back to his senses. Now, I find it hard to believe that there is any relation between sugar and the role it plays in alleviating stroke-related symptoms, and I would like to ask an expert's opinion on this.

PS: He's a diabetic too.