I am 19 years old .. . i use zolpidem hemitartarate but can not sleep for more than 2 hours at night can i take another 10 mg tab after 5 hours again?

Sleeplessness: Try alternative routes to a good nights sleep. Exercise regularly - more vigorously and longer than anything you do now. Eat regular meals. Avoid caffiene, alcohol and any other stimulants. Keep a regular routine. Do not eat within 2 hours of sleep. Good luck! Sleeping pills are addictive and should be avoided whenever possible.