Hammocks that do have feature a spreader bar
If you like the idea of your hammock wrapping up next to you like a comfortable blanket then you may enjoy a non spreader bar hammock, as the name implies there is no bar that separates the suspension cords that attach to the main body of the hammock.
This type of design is very common with the hammocks from Brazil or Mexico, the ideal way to lie in this type is diagonal rather than in a straight line.
This makes it much more comfortable on your back and provides a smooth alignment of your spine in relation to the hammock.
This type of hammock will not tip as easy as a spreader bar type will so jump in and relax!