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Watch Inside the Factory Season 5 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Gregg Wallace visits a mattress factory in Leeds, where he discovers how steel is stretched and coiled into springs and the advantages of natural fibres like hemp and wool. Cherry Healey talks to a sleep scientist about the benefits to reaction time from taking an afternoon nap, and Ruth Goodman tries out a Middle Ages mattress made out of a straw-stuffed sack.