To ensure that your body and mind stay in good condition always, you need to rest them at regular intervals in order to revitalize them. For the body, a good night sleep gets you all the revitalization. For the mind, the best way to revitalize is to relieve it at least for an hour or two everyday from the daily mundane routines.
You can do that very easily by focusing on spending an hour with your kids and spending another hour focusing on comedy shows and even cartoons. By doing this and laughing enough for the day, you are actually resting your active mind and thus providing it room for revitalizing itself. So, go ahead, and have fun every day without fail and stay healthy.