I used the '90 minute sleep rule' to stop morning grogginess — and it's better than any alarm clock
The '90 minute sleep rule' involves timing sleep and wake times to align with the body's natural 90-minute sleep cycles to reduce morning grogginess. By waking at the end of a cycle during light sleep, individuals may feel more refreshed and alert. The method emphasizes sleep quality and timing over total sleep duration.
- ▪The 90 minute sleep rule is based on the length of a typical sleep cycle, which includes light sleep, deep sleep, and REM sleep.
- ▪Waking during light sleep helps reduce sleep inertia, the groggy feeling caused by being abruptly awakened from deep sleep.
- ▪Sleeping and waking at consistent times aligned with sleep cycles can improve health, longevity, and daily performance.
- ▪Tracking sleep patterns can help individuals adhere to a routine that supports waking at the end of a 90-minute cycle.
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Wellness Sleep I used the '90 minute sleep rule' to stop morning grogginess — and it's better than any alarm clock Features By Eve Davies published 2 May 2026 Sleeping in 90 minute blocks is my secret to waking up with enough energy to run. A doctor explains why it works When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. (Image credit: Future) Copy link Facebook X Reddit Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter When you're trying to sleep well, there common rules, like no caffeine after 2pm, no phones in the bedroom.
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