Survival theory of sleep

[perpetual]

In last year's STAV paper, the answer  to question 13 (strongest support for survival theory out of four options) is
'In the case of large animals, predators tend to sleep more than do their prey'.
However, there's another option related to survival theory:
'Larger animals tend to sleep more than do smaller animals'.

Wouldn't that be the correct answer, as if survival theory is being applied, prey should sleep more to keep away from predators?
I'm really confused...

[ktrah]

I think it's because smaller animals are usually more vulnerable so they generally sleep more than larger animals to stay hidden, but it also depends on how much time they need to find food.

[dzzhao]

In last year's STAV paper, the answer  to question 13 (strongest support for survival theory out of four options) is
'In the case of large animals, predators tend to sleep more than do their prey'.
However, there's another option related to survival theory:
'Larger animals tend to sleep more than do smaller animals'.

Wouldn't that be the correct answer, as if survival theory is being applied, prey should sleep more to keep away from predators?
I'm really confused...

Ask yourself this, do zebras sleep longer than bats?