You are feeling sleepy...
Avoid driving while tired:
Stop Driving
Take a nap for at least 15 to 20 minutes
Take frequent breaks at service areas
Get plenty of sleep the night before a long trip
Never drink and drive
Be aware of the signs that you are tired
Take frequent breaks at least every two hours or 100 miles
There are times, either during your driving lessons or after you have passed your driving-test, that you will feel tired in the car. If this happens, follow the advice below.
On some roads, particularly on motorways, you will see signs that say 'Tiredness kills - Take a break'
At 60 m.p.h., falling asleep for just one second will mean that you travel about 30 metres with no control.
Try walking briskly 30 metres with your eyes tightly closed and see how it feels!
Beware!
Opening the window, turning on the air conditioning, or playing loud music are an
OK short term fix to get you to the nearest safe parking place but they are not effective in keeping drivers alert for any extended period of time. If you feel tired,
stop as soon as possible for a walk or a sleep - on a motorway this means taking the first available exit (or service area if this comes before the next exit).
Warning signs
You may be suffering from drowsiness or fatigue if you become aware of any of the following points. Continuing to drive in this condition will put you 
at serious risk of being involved in a fatigue-related crash. You should park the car in a safe place at the first opportunity and get some rest.
- Can't remember the last few miles driven
- Have wandering or disconnected thoughts
- Experience difficulty focusing or keeping your eyes open
- Have trouble keeping your head up
- Drift out of your lane or hit a rumble strip
- Yawn a lot
- Follow other traffic more closely than normal
- Make sudden steering corrections
Don't try to struggle home when you are tired - You might only make it as far as the nearest hospital operating theatre (if you're lucky).