Coffee contains caffeine as stimulant that causes insomnia and as a residual substance within the body so the best way is to get rid of it from the food you eat or drinking caffeine after lunch onwards and Don't forget to caffeine hidden in soft drinks and snacks, such as coke, chocolate is important cause that cause insomnia. Should be changed to Drink herbal teas such as chamomile tea or flower tea lemon that allows mind to relax instead of tea or coffee. Since in both types of tea contain compounds that help calm the mind. And decaffeinated