Do anyone know if the effects of hibernation can be reversed for mammals? i.e. heat lamps etc?

Answer 1

What makes animals hibernate?
There are still a lot of things that scientists do not know about hibernation and what exactly causes hibernation is one of these things. However, some research shows that there are a couple of different triggers for hibernation. For some species a reduction of the food supply and a change in the temperature and amount of light will make the animals long for their dens and a good winter’s sleep. Other animals seem to have an internal clock that tells the animal it is time to go to sleep. Scientists have found that animals that hibernate have a unique compound in their blood which is called HIT – hibernation inducement trigger.

Answer 2

Yes they can. Quite often hibernating mammals wake up early when temperatures are warmer than usual. And you can do it artificially with a heat lamp.