BWE Neck Exercises

After I had a rough sparring session last week where I took some heavy hooks, my neck was aching for the next 3-4 days (and I can still feel it now, more than one week afterwards) so I figured out that my neck is just too weak.
I've never really done specialised neck training and I hate lifting weights, so all my conditioning is done using BWE's, running and the Boxing training itself.

Are there any good workout plans wich I could use daily to strengthen my neck? Like, let's say, ca. 20 min before I go to bed or something like that?

Thanks, and please excuse my bad english, for I'm not a natural speaker.