Getting enough sleep is important for keeping your immune system strong and protecting you from coughs, colds and viruses.
Sleeping less than six hours a day can make you four times more likely to develop a cold than those who get more than seven hours.
A very effective way to reboot your sleep is Sleep Restriction Therapy (SRT).
The principles are simple: for a few weeks you have to reduce the amount of time you spend in bed, ensuring that when you go to bed you are really tired. This means that you will fall asleep more quickly, stay in deep sleep for longer and wake up less frequently during the night.
Reducing the amount of time you spend in bed increases your sleep drive (your urge to sleep). Also, it helps lessen the negative associations that have built up in your brain, linking the idea of bed with the stress of bad sleep.