Hello,
You can gently shake him , call his name and ask if he can hear you. If not responsive , you need to check his breathing and pulse and do Cardiopulmonary ressucitation if it is indicated and if you are trained and able to do that until 9-1-1 people or ambulance arrives.
For constant sleep he needs to be seen by a doctor for an evaluation as soon as possible or you can take him to an Emergency Room. It can be due to diabetes or some other causes.
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Edited by vyetimyan on October 3 2006 at 12:37 PM