An apparatus for resting a head of a user during sleep has a layer of closed cell foam disposed over a layer of open cell foam. Furthermore, a corresponding problem analysis system is provided. The first structured metal layer is bonded to the electrode pad via a first bond layer of a conductive material, wherein the first bond layer has a thickness of less than 10 \u03bcm. Thus, smooth and dense sidewalls cannot be achieved, which is a prerequisite for an effective barrier layer, which prevents copper from being diffused into the low-k dielectric material. The guard includes an elongated generally C-shaped body that includes a plurality of ridges for gripping the structure to which it is attached.