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Causes insomnia EssayThe evolutionary theory ignore be directly linked to Darwins theory of survival of the fittest as any properties we require now are a result of what has been useful in the past therefore we cessation as it has been useful for our survival or it was at ane time. Conservation was an idea that the theorist Webb came up with he suggested that those animals that slept more were more likely to survive such as hedgehogs.Conservation is where the embody slows down the metabolic process and heart rate as no food is being consumed and no energy is being used up as the animal is not pitiful about. Webbs theory is linked to hibernation mostly as his theory is more suggesting the likelihood of surviving due to sleeping. By looking at both theories I can now come to the conclusion that the restoration theory is more logical in its use of energy as it suggests that the more energy you use up in the day the more you look forward to going to bed to restore tissue and sa ve energy.It also suggests that even if you dont fully exert yourself in a day it doesnt mean that your not going to sleep for long and this can be fully evident in teenagers as even if they do or dont exert themselves they still sleep a lot more as there bodies are developing and they need more sleep then the rest to gain in energy and also to give there bodies a time to relax as there bodies will be invariably secreting hormones.The cause and effect of insomnia still arent fall out as the Pineal gland in the brain converts the neurotransmitter serotonin into the hormone melatonin. Melatonin is released into the blood stream and causes rhythmic changes or so the body although the need for sleep is not affect by light. Melatonin plays a role in the co-ordination of the sleep wake cycle. So as sleep isnt affected by light then the cause of insomnia cant be known as you cant determine what effects the body that causes insomnia.REM sleep involves an outgrowth in energy expenditur e and blood flow which inhibits protein synthesis on the other hand it is known that amino acids are not stored by the body and last in the body for bout 4 hours after a meal. This means that protein synthesis maybe stopped half way through sleep because the amino acids have run out. Also people will sleep more after stress and it is known to improve moods which again can be explained by the fact that with NREM sleep occurring during slow wave so enables the body to repair itself and there is an increase in secretion of growth hormones.By looking at the evolutionary theory I can also conclude that the arguments presented for the evolutionary theory contradict themselves as approximately suggest that some animals sleep less to keep a vigil while others suggest that animals sleep longer to keep motionless thus staying away from harm. Also it is clear to see that animals such as lions do sleep longer as they are at less of a risk from being hunted so dont need that much sleep and anim als like cattle need very little sleep and this puts them in danger of being hunted.