Certain sleeping pills such as Ambien sleeping pills seem to have the problem of making people gain weight.
The way they do that is by increasing a persons appetite and people want to eat more and more so they gain the weight.
So it's not actually the sleeping pill itself that causes weight gain but since the sleeping pill increases some peoples appetite then they want to eat more.
That is what happened to me.
When taking Ambien sleeping pills I noticed my appetite increased and I ate more and more and then I put on the weight.
I asked my doctor and he said the sleeping pills like Ambien can cause some people to have an increase in their appetite.
After I stopped taking Ambien I no longer had an increase in my appetite and then I lost the weight again.