We also know that a lack of sleep impacts your immune system. So a lack of sleep will age you by almost a decade in terms of that aspect of virility and wellness. We know that men who are sleeping just five to six hours a night have a level of testosterone which is that of someone ten years their senior. Firstly, we know that sleep deprivation affects the reproductive system. What are the effects of sleep deprivation on the body? Well, there are many different effects. The more protein that builds up, the greater your risk of going on to develop dementia in later life. So if you're not getting enough sleep each and every night, more of that Alzheimer's-related protein will build up. We also know that a lack of sleep will lead to an increased development of a toxic protein in the brain that is called beta-amyloid and that is associated with Alzheimer's disease because it is during deep sleep at night when a sewage system within the brain actually kicks in to high gear and it starts to wash away this toxic protein, beta-amyloid. You can't essentially make and create those new memories. So those new incoming informational emails are just bounced, and you end up feeling as though you're amnesiac. We certainly know that a lack of sleep will actually prevent your brain from being able to initially make new memories, so it's almost as though without sleep the memory inbox of the brain shuts down and you can't commit new experiences to memory. Matthew Walker: My name is Matthew Walker, I am a professor of neuroscience and psychology at the University of California, Berkeley, and I am the author of the book " Why We Sleep." What did work was the Sleep Expert's alarm, which can be configured in the mobile app, and will wake you during a particular time window when it detects that you're sleeping lightly - very similar to the Smart Wake feature you'll find on the best Fitbits.Account icon An icon in the shape of a person's head and shoulders. The Withings Sleep Analyzer is a thin mat that lies horizontally across the whole width of your side of the mattress, which avoids that particular problem. It's possible that some of these discrepancies could have been due to us turning over during the night, which would cause us to move away from the small sensor under our mattress. When it worked, the SleepExpert also recorded figures for our heart rate, respiration rate and interruptions in breathing (a sign of sleep apnea, which should be investigated by a doctor), but we found that data difficult to trust. We know this for a fact as we always wake up in the night either to the dog barking or partner snoring, and find it difficult to go back to sleep, so the wake-up frequency figure should have been much higher. The sleep duration looked accurate (most nights we got the seven hours sleep it displayed) but the wake-up frequency information was wrong. On some mornings we would discover the app had recorded no data overnight, and on others there would be numerous numbers that looked pretty believable until we looked more closely. That might be one of the reasons why its performance leaves so much to be desired. It's interesting that the SleepExpert doesn't require any extra configuration, unlike the Withings Sleep Analyzer, which takes a while to run through some tests to ensure it's compensating correctly for your mattress. The SleepExpert is thin and unobtrusive, so you won't feel it at night (Image credit: Future) Its only other features are two lights: a green one that illuminates when the device is powered on, and a blue one that shows whether the SleepExpert is connected to your phone via Bluetooth. This is quite long, but you'll still need a power outlet close to your bed as the SleepExpert doesn't have a rechargeable battery. It has a micro-USB port on the edge, and is supplied with a power cable. It's a small, flat disc measuring 6" in diameter, and 0.4" thick, which allows it to slip easily under your mattress. DesignĬhoosing the best mattress is a good start for getting a proper night's sleep, but if you still wake feeling groggy, the Beurer SE 80 SleepExpert is designed to find out why, without the need to wear a fitness tracker on your wrist at night. However, in our experience a cheap fitness tracker like the Xiaomi Mi Smart Band 6 will give more accurate and consistent results for even less money. For comparison, the Withings Sleep Analyzer starts at around twice the price. That makes it one of the most affordable non-contact sleep trackers around. It varies greatly in price, and starts at around £44.99 (about $60 / AU$80). The Beurer SE 80 SleepExpert launched in April 2016, and is available from various third-party retailers, including Amazon.
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