coffee ,tea contains caffine which is a natural stimulant which can causes insomnia
to most people.
coffee or tea must be avoided atleat 2hours BEFORE bed time.
A VERY INTERESTING FACT IS THAT SOME PEOPLE WHEN NOT ABLE TO SLEEP PREFER A CUP OF TEA OR COFFEE,THIS FURTHER ENHANHANCES THE PERIOD OF INSOMNIA,AND TO FIND RELIF PEOPLE PREFER ANOTHER CUP.
YOU MUST NOT ALLOW THIS VISCOUS CYCLE TO OCCUR.