"i am 24 years old, i had to stay awake during the nights of the last week due to a university exam. four days after the exam is finished i can not sleep well because my bed time has changed. and i feel so tired during the day. last night at 2:45 am i took one (50 mg) tab and after 30 - 40 min i slept deeply. at 9:00 am (after 6 hours) i woke up feeling little bit heavy and sleepy, so i went beck to sleep for another 2 hours. after that i woke up feeling fresh and energetic like if i had a good continous sleep through the night."