Play now, pay later: consistency matters when it comes to kids and sleep. iStockphoto.com hide caption toggle caption iStockphoto.com Shots - Health News Random Bedtimes Breed Bad Behavior In Kids October 15, 2013 Random bedtimes have more influence on a child's behavior than going to bed late, a British study finds. That was true at home and at school. Researchers say that failing to hit the hay at the same time every day may mess up circadian rhythms and brain development. Fortunately, the ill effects are reversible.