ElI5: Why can you fall asleep so easily on the sofa instead of the bed?

Question

ElI5: Why can you fall asleep so easily on the sofa instead of the bed?

In: Other

Answer 1

You sleep on the sofa BECAUSE you suddently fell asleep while already being on the sofa. Not the contrary.

You sleep on the bed because you intend to go to sleep, which may not happen suddently. It is therefore common to go on your bed and not fall asleep.