I haven't been able to sleep well for the past week or so. this is starting to really depress me. what is the best medication to take to fall asleep?

Exercise: Exercise with good sleep hygiene is in my experience best for sound sleep. Reviewing your medicine I see Xanax (alprazolam) listed. Xanax (alprazolam) is a benzodiazepine, a class of drugs well known to alter the sleep-wake cycle. If you suffer from a serious psychiatric condition please talk to your psychiatrist about your lack of sleep.