Sleep Deprivation

Outline one example of a circadian rhythm
A circadian rhythm is a biological rhythm that’s happens every 24 hours. An example of a circadian rhythm is the sleep-wake cycle. Every day we will sleep and we have adapted to this over time as generally speaking we are awake in the morning and asleep at night. Exogenous zeitgebers and endogenous pacemakers work together to control this biological clock, to keep the cycle in-sync adjusting the inherited genetic clock with the environment by sensing when it is light through communication between the pineal gland and SCN, producing hormones such as melatonin to make us sleep. It is also shown that we will still go through the 24hr sleep wake cycle when our environment changes and there are no external factors, showing that our bodily functions are controlled inside in 24 cycles. Supporting this, the SCN, when in petri dish still works in a 24.5 hour cycle!
Outline and evaluate one or more explanations for sleep disorders.
Explanations of sleep disorders tend to have a behavioural and biological theory to explain them. Insomnia is one of them that has many genetic factors as well as environmental.
Insomnia is a sleep disorder where you basically are unable to sleep. There are two types of insomnia, primary and secondary. Primary insomnia is the illness itself.   The sleeplessness is not caused by a medical, psychiatric or environmental cause. This sleeplessness would have to last at least one month, does not occur purely during other sleep disorders such as narcolepsy and is not because of possible physiological effects from using drugs and medication. If there are other underlying causes to the disorder, it would then be secondary insomnia where a psychiatric (depression) or medical disorder (chronic pain) causes the sleeplessness. They range from causes such as hormone changes, asthma, stimulants and temperature etc.
As I said earlier, primary insomnia is the illness itself and is not affected by medical and...