The disclosure relates to an adjustable bed and foundation thereof, in particular incorporating springs or other support elements into the adjustable bed foundation or frame. The adjustable bed can include one or more foundation spring support sections mounted on or in a mattress support surface of the bed foundation. Spring support sections having different firmness levels in different mattress support sections can provide a varying support level to a user of the adjustable bed foundation combined with a mattress thereon. Spring support sections that are discrete from each other can permit articulation of the corresponding mattress support surface sections without creating bending, elongation, and/or compression stresses which might otherwise cause uneven support from or damage to a continuous spring support element spanning multiple mattress support surface sections.
