I'm a caffeine addict and gave it up for a month when I done Carol Vordermans deetox diet. Missed it for few days ,bad headache then ok for rest of month .Unfortunately I finished the diet(was only meant for a month) and went straight back on it again ! I'm not a good sleeper so I dont drink coffee in the evening cept the odd decaff , yuk, But cant bear not too have my daily dose, I am a coffee snob and only like the best, NO instant.Oh and you cant beat a cup of coffee to get things moving!!