Can I say "keep the rule" instead of "follow the rule" here? Or are two expressions different?
Native speaker’s answer
Rebecca
Yes, I believe "keep the rule" would work here. Since he introduced the 90-minute sleep rule at the beginning of the video, it would work to use it at the end of the video. However, it wouldn't work at the beginning of the video because many may not know what this 90-minute sleep rule is. Ex: And so if you want to wake up feeling especially alert and refreshed, simply keep the 90-minute rule.