Recently, another answer to this question is simple: the hibernation of mammals can be called a deep sleep in which body temperature decreases, but does not fall below zero. Hibernation - it is only slowing of life processes. Stupor same (suspended animation) invertebrates - an almost complete suspension of these processes. Now we know more, and so give a simple answer is we can not. Full stop living processes does not occur in the petrified invertebrates such as insects have. They do not have the complete cessation of metabolism, juices of their bodies do not freeze, but only supercooled. The same phenomenon can be observed at the petrified reptiles and amphibians (the crucian carp, which looks like "frozen through and through"). A strong decrease in body temperature can be observed in a number of mammals, although they have it and not fall to zero, at least under natural conditions. And yet not every mammal is immersed in the present state of hibernation: some is just a long, more or less sleep.
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