An adjustable bed foundation includes an adjustable frame and at least one height adjuster configured to raise and lower a portion of the adjustable frame. The adjustable frame defines a support surface, a bottom surface opposite the support surface, and a plurality of lateral side surfaces intersecting each of the support surface and the bottom surface. A fabric at least partially covers the plurality of lateral side surfaces and is secured to a material covering the support surface. An oscillating motor is disposed within the adjustable frame and configured to impart vibration to a mattress disposed on the adjustable frame. The oscillating motor is secured to the adjustable frame by a flexible fastener, and a gap between the flexible fastener and the support surface is between about 2 mm and about 10 mm. Related methods are also disclosed.
