Quiet Life Tablets have been unavailable for a while you may like to consider :
Kalms or Bach Rescue Remedy

To relieve periods of worry, irritability, stresses and strains.
Promotes natural sleep.

A traditional herbal remedy.

Quiet Life Tablets are a nervine which help nervous disorders, and a sedative which helps promote relaxation. They also contain B vitamins; thiamine hydrochloride (vit B1), riboflavin (vit B2) and nicotinamide (Vit B3), a deficiency of which can cause nervous symptoms.
Other beneficial ingredients include hops, passiflora and valerian dry extract.

Not recommended for children.
Do not take if pregnant or breast feeding.