Caffeine's 'Boost' Disappears When You're Extremely Sleep-Deprived
http://www.livescience.com/55101-caffeine-does-not-help-sleep-deprived-people.html
Caffeine's 'Boost' Disappears When You're Extremely Sleep-Deprived
In the study, caffeine stopped being significant after 2-3 days of 5h sleep compared with placebo. (200mg twice a day, if I read this right?)
"Results showed that the caffeinated group had faster reaction times during the first two days compared with the placebo group, but not on the last three days [out of 5] of the experiment, [...] The people who took caffeine reported feeling happier than those who took the placebo only on the first few days of the experiment." + "those in the caffeine group rated themselves more annoyed than those in the placebo group"
Study did not increase amount of caffeine
