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This insect is about 0.5 mm in length, so it is very small. It doesn't have legs I don't believe, I am not too good at this but I don't know if it's a worm or more like a cocoon for something.

I do find this alarming because I found this one underneath my bed sheet on the mattress. Now I do recall seeing something similar on the crack of the shaky tile floor, so I can't tell if it's just an apartment pest or it actually lives in mattresses.

Any help in identification would be appreciated. Thank you.

One side

Back side

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Where are you located in the world? – Rory M Nov 30 '13 at 13:01
Toronto, Canada. – stross_relief Dec 2 '13 at 17:32

It's carpet beetle larvae. It's a serious pest, right behind the bedbug. The larvae were found on an old mattress.

I found about 4 more afterwards.

enter image description here

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This could probably be many different species in the family Dermestidae, which often have fairly similar looking larvae. The carpet beetle is a good bet thought since many of the other common species feed on animal materials (food, insect collections, fur, leather etc.) – fileunderwater Dec 4 '13 at 23:28

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