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You can go down to the Table 2 of the study you linked and see that's pretty much exactly the data they got (https://pmc.ncbi.nlm.nih.gov/articles/PMC3805807/table/T2/)

Going from 7.8 to 7 hours and taking 50 instead of 20 minutes to fall asleep is significant for the purposes of this study, but that's not what insomniacs and anxiety patients talk about. Insomniacs who lie awake until 4 in the morning and get 3 hours of sleep routinely because they're so worried by the cup of coffee they had or the supplement they forgot don't do so because they have a physiological reaction to some caffeine, it's a mental problem.




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