When pulled out, regular trundle beds remain at a height lower than the parent bed. However, pop-up variants also exist. 
A pop-up trundle bed can be raised to meet the height of the normal bed, effectively creating a wider sleeping surface when positioned side-by-side. A lever on the side of the pop-up trundle is typically used to raise and lower a trundle bed.
|This article about furniture or furnishing is a stub. You can help Wikipedia by expanding it.|