However fit you are, you have to stop and take regular short breaks (but not for so long as to let your body temperature fall).

As the saltwater temperature now lowers, would both containers have nearly identical results regarding temperature fall and rise?

During hibernation, metabolic rate and body temperature fall dramatically, and the animal may cease breathing altogether for periods of up to an hour.

"I have more than once seen the temperature fall to thirty and forty degrees below zero, and the Angara has still carried down drifting ice without entirely freezing.

From about the end of November both day and night temperature fall rapidly and December is usually the coldest month of the year with the mean daily minimum temperature at about 13 C. The cold waves over northern India sometimes affect the place and the minimum temperature may drop to about 5C.