I take Ambien now once in a while too. I have found that it doesn't work for me always either and I have also found out that it is because of food in the stomach., On nights when I don't have a big dinner, it hits me PRONTO, like 15 minutes after taking it. If I've eaten, then it can be up to an hour or more.. I'm not sure how long after you eat your stomach is empty, but I'd bet if you waited 2 hours after eating it would be better.
Diagnosed with U/C January 31st, 2004, IBS on July 21st, 2006
In Remission since December 11th, 07, with no U/C meds at this time! But, I do take:
Xanax .5mg as needed - Effexor 37.5mg. - Culturelle 1x a day
Plus Now I'm on HRT.... ARGH.. menopause.. Estradiol, .5mg 1x a day