won’t go to sleep or doesn’t go to sleep

[Sun14]

Hello, my friends,
I was wondering which is more natural to say if I want to tell others every night only if I tell a story to my little son, he would like to go to sleep.

1) My little son doesn’t go to sleep unless I tell him a story every night.
2) My little son won’t go to sleep unless I tell him a story every night.

 

[heypresto]

They both sound equally natural to me.

 

[se16teddy]

The logic of the sentence seems a bit off. It seems to imply that, if you tell him a story every night, he can sleep fine in the daytime as well!

 

[Loob]

The sentence sound fine to me - unlike teddy, I don't see it as ambiguous.

And I think the "won't" version is slightly more likely, in that it intrduces an element of feeling to the sentence, whereas the "doesn't" version is just a statement of fact. But they're both natural, as heypresto said in post 2.