I don't believe that ambien has a line in the middle to cut the dosage in half. If if it does not have the line then you cannot cut it in half. I believe that is the question you were asking. Hope this helps!

Dosage is for a reason, better to talk to the physician or speak to the pharmacist. For all I know you can risk developing a tolerance

Thank you Jim for your input. Sleep deprivation in which I also suffer from sleep apnea that pretty much goes untreated is a very large part of my problem

I'm proud that you don't take it every night however if you're not sleeping properly by taking half of an "Ambien" depression may seep in. I use Ambien and have been warned about it's long term use as it may affect the liver.