How much sleep should i get (i'm a 19 year old male)?

Probably 8 hr: During the growing years a teen needs 9 or more hours of sleep per 24 hrs. Growth spurts and physically demanding activities can add to the need.As growth and extra activities decline, most will find 8 hour enough. Failure to keep up with the sleep requirement can show up in a variety of ways. Poor academic performance in school, sleep walking, etc.