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Have you ever [wandered / wondered] why you are hungrier than usual if you do not get a [good / well] night's sleep? Researchers from the University of Chicago say they have [finding / found] one reason. Their study [reveals / revels] that a lack of sleep makes people [hungrier / hungrily] the following day. Sleeplessness releases [chemical / chemicals] in the brain that enhance the pleasure derived [at / from] eating, which also makes us eat more. We want to eat food that is high [in / on] calories. The researchers found that sleep-deprived people [craved / carved] crisps, sweets and biscuits far more than healthier foods. The researchers also reported that people in the study who did not get enough sleep ate up to twice as [many / much] fat content as when they had slept for eight hours.

The study was [contracted / conducted] on 14 male and female volunteers [in / on] their twenties. They were observed by researchers in two [difference / different] situations. In one, they [spent / spending] 8.5 hours in bed each night and averaged 7.5 hours of sleep. In the other, they spent just 4.5 hours in bed and [averaging / averaged] 4.2 hours of sleep. The researchers noted that in the [first / firstly] situation, the subjects ate three meals a day, as normal. However, in the second situation, where they had [been / being] deprived of sleep, the volunteers were unable to [resistance / resist] what the researchers called "highly palatable, [rewarded / rewarding] snacks". This happened just 90 minutes after they had eaten a meal that supplied them with 90 per cent of their [required / requirement] daily calories.