The small footprint still delivers a 91 x 190cm sleeping area – equivalent to the dimensions of a standard single mattress – and there's also a slightly larger 108 x 190cm option available which can sleep two guests at a push, although they're going to need to get pretty cosy.

Sponges, the members of the phylum Porifera ( / p ə ˈ r ɪ f ər ə/; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. [2] [3] [4] [5] [6] They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.

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In the 1990s, sponges were widely regarded as a monophyletic group, all of them having descended from a common ancestor that was itself a sponge, and as the "sister-group" to all other metazoans (multi-celled animals), which themselves form a monophyletic group. On the other hand, some 1990s analyses also revived the idea that animals' nearest evolutionary relatives are choanoflagellates, single-celled organisms very similar to sponges' choanocytes – which would imply that most Metazoa evolved from very sponge-like ancestors and therefore that sponges may not be monophyletic, as the same sponge-like ancestors may have given rise both to modern sponges and to non-sponge members of Metazoa. [113] Although most of the approximately 5,000–10,000known species of sponges feed on bacteria and other microscopic food in the water, some host photosynthesizing microorganisms as endosymbionts, and these alliances often produce more food and oxygen than they consume. A few species of sponges that live in food-poor environments have evolved as carnivores that prey mainly on small crustaceans. [11] a b c d Vacelet J (2008). "A new genus of carnivorous sponges (Porifera: Poecilosclerida, Cladorhizidae) from the deep N-E Pacific, and remarks on the genus Neocladia" (PDF). Zootaxa. 1752: 57–65. doi: 10.11646/zootaxa.1752.1.3. Archived (PDF) from the original on 2008-09-06 . Retrieved 2008-10-31.

Although the layers of pinacocytes and choanocytes resemble the epithelia of more complex animals, they are not bound tightly by cell-to-cell connections or a basal lamina (thin fibrous sheet underneath). The flexibility of these layers and re-modeling of the mesohyl by lophocytes allow the animals to adjust their shapes throughout their lives to take maximum advantage of local water currents. [31]Ereskovsky AV (2010). The Comparative Embryology of Sponges. Russia: Springer Science+Business Media. ISBN 978-90-481-8575-7. Those who like memory foam seem to love it – as one owner told us: 'my memory foam mattress is the most comfortable mattress I’ve ever had'. Archer, Stephanie K.; Kahn, Amanda S.; Thiess, Mary; Law, Lauren; Leys, Sally P.; Johannessen, Sophia C.; Layman, Craig A.; Burke, Lily; Dunham, Anya (24 September 2020). "Foundation Species Abundance Influences Food Web Topology on Glass Sponge Reefs". Frontiers in Marine Science. Frontiers Media SA. 7. doi: 10.3389/fmars.2020.549478. ISSN 2296-7745. Material was copied from this source, which is available under a Creative Commons Attribution 4.0 International License. In the 1970s, sponges with massive calcium carbonate skeletons were assigned to a separate class, Sclerospongiae, otherwise known as "coralline sponges". [90]