Have you ever wondered why you are hungrier than usual if you do not get a good night's sleep? Researchers by for from in of on up with the University by for from in of on up with Chicago say they have found one reason. Their study reveals that a lack by for from in of on up with sleep makes people hungrier the following day. Sleeplessness releases chemicals by for from in of on up with the brain that enhance the pleasure derived by for from in of on up with eating, which also makes us eat more. We want to eat food that is high by for from in of on up with calories. The researchers found that sleep-deprived people craved crisps, sweets and biscuits far more than healthier foods. The researchers also reported that people by for from in of on up with the study who did not get enough sleep ate by for from in of on up with to twice as much fat content as when they had slept by for from in of on up with eight hours. The study was conducted by for from in of on up with 14 male and female volunteers by for from in of on up with their twenties. They were observed by for from in of on up with researchers by for from in of on up with two different situations. In one, they spent 8.5 hours in bed each night and averaged 7.5 hours by for from in of on up with sleep. In the other, they spent just 4.5 hours by for from in of on up with bed and averaged 4.2 hours by for from in of on up with sleep. The researchers noted that by for from in of on up with the first situation, the subjects ate three meals a day, as normal. However, by for from in of on up with the second situation, where they had been deprived by for from in of on up with sleep, the volunteers were unable to resist what the researchers called "highly palatable, rewarding snacks". This happened just 90 minutes after they had eaten a meal that supplied them by for from in of on up with 90 per cent of their required daily calories.