Not a whole lot.
I would suggest swallowing ambien - snorting it is not wise (for many reasons - one being it is less effective). 10mg is a typical dose for those newly prescribed the med for sleep (was my prescription dose about a year ago) so expect to MAYBE feel like you want to fall asleep. If you choose to not sleep- you may just feel 'odd'. If you were to take a little more and stay up, you may see things.
Try using the search function - there are some other posts about this.