According to a Journal of Archaeological Science
paper an apparent sleeping area for Neanderthal has been unearthed in Esquilleu Cave in Cantabria, Spain. It is estimated to be between 53,000 and 39,000 years old. The remains indicate that he slept and worked there on the same grass beds near warming hearths. Evidence from other sites confirm that he prepared stone tools, cooked, ate and slept near hearths. With this level of resourcefulness the question of how he went extinct remains unanswered. Competition with and/or absorption by modern man are plausible explanations.