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Introducing Sleep Debt on Ultrahuman - a novel way to understand your personalised sleep needs. The sleep debt counter resets every week to give you a chance to start afresh. When it comes to sleep, the debt is easy to accumulate but hard to pay back. Here’s more about it: 1. For sleep health, consistency matters more than maximing sleep on a single day or weekend. Catching up on your sleep might not be the best way to sync with your circadian clock and it increases many risk factors: 2. Unhealthy weight gain: A study published in Current Biology found that irregular sleep patterns, such as "catch-up" sleep on weekends, are linked to circadian rhythm disruption. This is linked to increased caloric intake, weight gain, and reduced insulin sensitivity compared to consistent sleep schedules. 3. Affects cognitive performance: Individuals with irregular sleep patterns perform worse on cognitive tests than those with regular sleep schedules, even if their total sleep time is similar. This is basis the Research from the Journal of Clinical Sleep Medicine. 4. Increased cardiovascular risk: Irregular sleep patterns are associated with a higher risk of cardiovascular diseases. Consistent sleep schedules help maintain stable blood pressure and heart rate, reducing the risk of heart-related conditions. This is basis a study published in the Journal of the American College of Cardiology. 5. If you’re pressed for time, allocating a specific window for sleeping and maintaining discipline around minimum sleep time is probably one of the best ways to firm up your health’s foundation.