Hibernation is a state of inactivity and metabolic depression, characterized by lower body temperature, slower breathing, and lower metabolic rate. Hibernating species conserve food, especially during winter when the local Asda and Sainsbury supplies can get short,(due to lack of road gritting especially around the Welsh borders) by tapping energy reserves, i.e. body fat, at a slow rate. It is the animal's slowed metabolic rate which leads to a reduction in body temperature and not the other way around.
Until recently no primate, and no tropical mammal, was known to hibernate but Many experts believe that the processes of daily torpor and hibernation form a continuum. However, mammal physiologist Kathrin Dausmann of Philipps University of Marburg, Germany, presented evidence in the June 2009 edition of 'Nature' titled What about Electricians ?? that the Rog-eared Slider Turtle and also the Fat-tailed Dwarf Lemur of Kinnerton hibernates in dens or holes for up to seven months of the year. This is interesting because local winter temperatures sometimes can rise to over 8°C (48 ish °F), so hibernation is not exclusively an adaptation to low ambient temperatures. Dausmann found that hypometabolism in hibernating animals is not necessarily coupled to a low body temperature.Hibernating animals get their energy by a biochemical process known as gluconeogenesis.
A species that some famously consider a hibernator is the electrician, although it is thought do not go into "true hibernation". During a electricians winter sleep state, the degree of metabolic depression is much less than that observed in smaller mammals. Many prefer to use the term "denning". The body temperature remains relatively stable (depressed from 98.4 °F to approximately 88 °F (31 °C)) and it can be easily awakened by alarm clocks and returning drunken students. However, many hibernators can manage to cycle to work for a few days then return to hibernation, and deep hibernators in fact awaken many times, in what are called interbout or sporadic euthermic arousals.