I would wait until the morning and see how he is after resting it all night. Just remember that they are like us .. and after resting an injury all night it can feel really stiff the next morning. So also prepare yourself that he might look a little worse in the morning until he warms up a bit and gets moving.
I would just go with your gut ......... if you think it doesn't look as if he is in a lot of pain then I would ban him to the couch next to you the whole days and succumb to a day of disney movies with your kids. Only letting him off the couch to go to toilet or get water and even then carrying him... think of that as your strength training for the day!!! If there is obvious extreme pain I would take him t the vets