Diabetes : A diabetic patient may lapse into diabetic coma or unconsciousness, but usually the affected person is aware of the symptoms before this occurs. You can assist at any stage by giving the casualty some sugar or sweets. Don't worry about creating an excess of sugar in the diabetic's bloodstream; an excess of sugar is far less dangerous than lack of it.
Sometimes it may be necessary to revive breathing and blood circulation to a person who has become unconscious due to a laboratory accident. Resuscitation may be helpful in such situations.