Sleeping Pills 3 Weeks After Tummy Tuck?

Hello,
Personally, I would be working to get your pain under control not sedating you with sleeping pills. Long term sleeping pill use is not good for your sleep-wake cycle. You can actually get to the point at which you are getting very little useful sleep by using them for too long.
This is of course a matter of opinion. I fortunately have little experience with sleep loss this far out perhaps due to my use of pain pumps in my tummy tuck procedures. Get your surgeon's help here.

Dear Mariela,
It is normal to notice more discomfort at night after any type of procedure. During the daytime, your brain has so many other things to focus on that a small amount of discomfort is tolerable and ignored. At night, your brain wants to "turn out the light" and not focus on anything, but the discomfort at the same level becomes more noticeable since there is nothing else going on. A sleeping pill should not be a problem, but is probably not the best solution. I'd rather suggest a very mild pain medication, such as Tylenol or ibuprofen. You should ask your surgeon for his / her advice, since they know you and your medical history, and can suggest the best medication for you.
Good luck!