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Driving when you are tired greatly increases your risk of collision. To minimise this risk

• make sure you are fit to drive. Do not begin a journey if you are tired. Get a good night’s sleep before embarking on a long journey
• avoid undertaking long journeys between midnight and 6 am, when natural alertness is at a minimum
• plan your journey to take sufficient breaks. A minimum break of at least 15 minutes after every two hours of driving is recommended
• if you feel at all sleepy, stop in a safe place. Do not stop on the hard shoulder of a motorway
• the most effective ways to counter sleepiness are to drink, for example, two cups of caffeinated coffee and to take a short nap (at least 15 minutes)

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Vision. You MUST be able to read a vehicle number plate, in good daylight, from a distance of 20 metres (or 20.5 metres where the old style number plate is used). If you need to wear glasses (or contact lenses) to do this, you MUST wear them at all times while driving. The police have the power to require a driver to undertake an eyesight test.
Laws RTA 1988 sect 96 & MV(DL)R reg 40 & sch 8

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Slow down, and if necessary stop, if you are dazzled by bright sunlight.

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At night or in poor visibility, do not use tinted glasses, lenses or visors if they restrict your vision.