 However, this also makes it harder to stay warm when temperatures plummet, either during the evening or seasonally, as a sleeping bag will be compressed under a camper's weight, reducing its ability to trap air and provide insulation.When deciding to commit to hammock camping most "hangers" trade their sleeping bags for down-filled or synthetic quilts.The quilts are divided into two different types, top quilts (TQ) and under quilts (UQ).