Finding it hard to get a good night's sleep? You're not alone. Disrupted sleep, not getting enough sleep, daytime tiredness, excessive sleepiness and irritability are very common, with between 20% and 35% of people affected. In general, there are three types of sleep problems: * difficulty falling asleep * frequently waking during the night * waking too early in the morning Sleep is essential for physical repair and refreshing the mind. Adults need between seven and nine hour