Ayurveda, the science of life, suggested that Aahar (diet), Nidra (sleep) and Brahmacharya (celibacy) plays an important role in maintaining healthy life. Nidranasha or Anidra (insomnia) is a common neurological disorder having difficulty in initiating or maintaining sound sleep. Conventional medical science frequently prescribes sedative and hypnotic like benzodiazepines drugs as a therapy of insomnia, which shows various side effects like tolerance and dependency. In traditional system several herbs are reported for treatment of insomnia. In this review, we have emphasises the role of Ashwagndha (Withania somnifera) towards the treatment of Insomnia.