nurse's notes

Should I think that drinking Coffee improves mental alertness? You know? i used to become drowsy if i spends several hours of blogging. The continues sitting down infront of the computer, made me sleepy and my brain refuses to work but if i drink coffee i became more mentally alert , fully active to continue blogging again and inspired to work better . But the side effect is that if i wanted to sleep it is hard for me to get a good sleep already . So that is the side effect.