insomnia
"I've taken this medication three different nights now and honestly, I haven't slept this deeply in ages!  However... from the time I take the medication to the time I get to sleep - I have no memories of this time period the next day.  Also, if I am sleeping and someone wakes me up after I've taken the ambien, I won't remember anything the next day from being awake at the time. Really upsetting to my boyfriend the next day..."