One thing I have noticed so far in Mexico’s Yucatan and Quinta Roo, in Honduras, in Guatemala, and in El Salvador is that bed mattresses have been quite hard. Of course, this is from the perspective of an American that longed for a memory foam or latex mattress, so bear that in mind. I love a mattresses that, although it gives me support, I can relax into and melt to sleep.
So, if you are like me, just be prepared for different sleep. When a hammock is available to try, opt for it and give it a try. If you have room in your bag consider a foam pad. (I sure wish I had that kind of room.)
There may be exceptions, of course. High end hotels that cater to Americans, perhaps. But I have not seen anything I call pillow top or soft.
Some hostel or low end beds are an unsupportive soft.