coffee definitely ruins my sleep no matter what time I drink it, so there's that. My father also had headache his whole working life on Sundays, not realizing

coffee definitely ruins my sleep no matter what time I drink it, so there's that. My father also had headache his whole working life on Sundays, not realizing that drinking coffee all week days but not on the weekend, that was probably coffee withdrawal that was giving him a headache by day 2.