Article about bad sleep

Difficulty in falling asleep, sleeping fitfully, wakefulness during the night; these are only a few of the more than 80 documented sleep problems that exist. What is worrying is that almost 30% of the population cannot get to sleep, or have too little sleep so often that it becomes 'normal' for them. Of course there are physical discomforts that can become obstacles to good sleep such as the temperature of the room, feeling sick, pain, noise. There are others such as changing of the clock.