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Our results were published and our experiment was replicated with a larger sample size with the same results. The more coffee you drink, the less sleep you will get at night.

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The highest difference in hours of sleep is 1.8 hours, making these results statistically significant as clearly drinking more coffee resulted in less sleep.

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After one week, the group with no coffee averaged 8.6 hours of sleep per night, the group with one cup in the morning averaged 7.9 hours, and the group with one in the morning and evening averaged 6.8 hours. All three groups got decent amounts of sleep, but the group with no coffee got the most.

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Our sample size is 30 randomly selected individuals, giving us a margin of error at 18.3%. This margin of error is a little high, and the experiment could be repeated with a larger sample size in order to get a more accurate result.

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We had the principle give us the list of all the students at the high school. We listed all the students from 001-800 and randomly selected the 30 students. Some lurking variables of this experiment are the selected students weight, metabolism rate, and their diet. These lurking variables can impact the effect of the caffeinated coffee.

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We aren’t able to blind our students because they will know if they are drinking coffee or not. They will also be able to talk to one another when their at school. There can’t be double blind in this experiment either because our team is only two people and we’ll have to see the students we put in each group.

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Our control group is the group that isn’t receiving any type of coffee or caffeine. In this experiment we don’t have a placebo, as nobody in this experiment isn’t receiving anything fake.

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We will replicate this experiment by going to a different high school far from the last one and run the same exact study and change nothing so it’s not different, only the students and high school.

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We went to the local high school in our area and had the principle to give us permission to give us the list of all the students (9-12) and run these test. We randomly selected the students from the list and we didn’t know them.

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How much sleep the high school student is getting each night.

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How much caffeine the high school student is receiving in a day.

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We divided the 30 high school students into 3 groups consisting of 10 students. One groups gets no coffee, another group gets one cup of caffinated coffee, the last group gets one cup of caffeinated coffee in the AM and PM.

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30 randomly picked high school students.

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Does drinking coffee with caffeine affect your sleep if you drink it at different times of the day?