Friend his teens years got 0-3 hours of sleep every night and is average guy height- 5'7 to 5'8 how is this possible don't you only grow when asleep?

Sort of: There are a few people that genetically need less sleep, typically about 4 hours a night. This is pretty rare but runs in families. More often it is not 0-3 hours of sleep, they just only think that. Also very common that this is not every night and they "make up for it" on weekends or vacations. Human beings are very bad judges of how much sleep so he may be getting more.

You grow when U grow: The average growing teenager requires 9 hours of sleep to achieve potential height.If your friend got by without, he may have sacrificed some final height due to overall sleep deprivation. Growth hormone does come out in higher quantity during periods of sleep, but it is not continuous over the total sleep period.The growth effect occurs around the clock.