You normally cannot interact with animals while they are asleep, making it impossible to raise their heart level. The heart level of cows and goats, however, is increased through successful milking, which can be done any time, including while they are sleeping. | You normally cannot interact with animals while they are asleep, making it impossible to raise their heart level. The heart level of cows and goats, however, is increased through successful milking, which can be done any time, including while they are sleeping. |