After reviewing the research literature on nightly sleep reduction and trying it himself, the author of your text, concluded that

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The author concluded from reviewing the research literature and trying it himself that many people can reduce their sleep to about 5.5 hours per night with no serious adverse effects other than daytime sleepiness when they are sedentary. This suggests that not everyone needs a full 8 hours of sleep and that some people may be able to function well on less sleep. However, it's important to note that this may not apply to everyone and that getting enough sleep is still important for overall health and well-being.

After Reviewing the Research Literature on Nightly Sleep Reduction and Trying