You must tell DVLA if you are very sleepy during the time you’d normally be awake because of a medical condition.
You can be fined up to £1,000 if you don’t tell DVLA about a medical condition that affects your driving. You may be prosecuted if you’re involved in an accident as a result.
Car or motorcycle licence
Fill in form SL1 and send it to DVLA. The address is on the form.
Bus, coach or lorry licence
Fill in form SL1V and send it to DVLA. The address is on the form.
Driving while tired
Read the leaflet ‘Tiredness can kill’ for more information on the dangers of driving while tired.