We will start by preparing the legs. There will be sensors on each leg which will reveal any restless leg movements overnight.

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If you have hair on your legs, shave the area discussed here before proceeding.

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Beginning with the left leg, use an alcohol swab to clean a 5cm wide, 10cm long area in the 'valley' between the outer shin and calf, about one third to one half of the way down the leg.

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Exfoliate the area with abrasive gel for 30 seconds.

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Repeat with the other leg.