If you are one of those who faces trouble falling asleep then the following piece of information might be beneficial for you. There is an OTC sleeping aid called Ambien, which is a branded form of generic zolpidem pills. This medicine is approved by FDA and preferred by doctors for the treatment of short-term insomnia and sleep-deprivation. The medicine has a sleep onset of 15 minutes which stays effective for up to 8 hours. A person shall take this medication right before the bedtime and shall dedicate the next 8 to 9 hours for sleep to feel fresh after waking up the next day.