Indian Valerian, Tagar or Sugandhabala Root

It was first recommended for insomnia by Galen.

Valerian reduces mental over-activity and nervous excitability, helping people who find it hard to ‘switch off’. It is beneficial for almost any stress-related condition, and, in general, has a calming, rather than directly sedative, effect on the mind. It is sometimes referred to as a “daytime sedative” because it can improve performance, concentration and memory during the day as well as help one to sleep better during the night.