Do jellyfish sleep?

I like “quoughts” (questions that provoke thoughts) and “Do jellyfish sleep?” is a good one. Jellyfish are interesting for lots of reasons, one of them being their place on the evolutionary landscape. The first jellyfish-like creatures (the ancestors of modern jellyfish) pitched up during the Cambrian explosion, more than 500 million years ago and are one of the first animal groups to boast organised tissues and a nervous system. There is nothing that could be described as a brain, but jellyfish neurons work in exactly the same way as vertebrate neurons. So do jellyfish experience anything akin to vertebrate sleep?

Donald Trump, basketball and the dangers of late-night tweeting

Donald Trump is famous for his late-night tweeting. Does this pattern of behaviour reduce his ability to perform during the day? He might be interested in research presented yesterday at the Sleep 2017 conference in Boston showing a correlation between late-night tweeting and the next-day game performance of professional basketball players. Over the course of six years, from 2009-2016, researchers drew data from the Twitter accounts of 90 National Basketball Association (NBA) players. In particular, they were interested in any athletes who made tweets between 11pm and 7am on the night before the game. On average, late-night tweeters scored fewer

Deep sleep, brain magnets and memory

Deep non-REM sleep appears to affect how well we commit a new task to memory Sleep specialists like to divide sleep into one of two states: rapid eye movement sleep (REM) and non-rapid eye movement sleep (non-REM). Since the discovery of REM and its tight link to dreaming in 1953, there has been a lot of research focused on this paradoxical wake-like state. But as we experience much more non-REM than REM during the night, non-REM or deep sleep might be the more important of the two states. It’s likely there are many functions of non-REM. It could simply be

The horrors of sleep deprivation

The definitive demonstration of the horrors of sleep deprivation appeared in a celebrated paper published by sleep research pioneer Allan Rechtschaffen and his colleagues in Science in 1983. They used rats. What nobody had managed until then was to design a set-up in which both experimental and control animals received exactly the same conditions but different amounts of sleep. The solution Rechtschaffen and co. came up with is as ingenious as it is disturbing. They installed a pair of rats in neighbouring cages. In the bottom of each cage was 3cm of water, but by standing on a record-player-like disk

Gessner’s bear

Last month, I hosted a post by historian Florike Egmond on my Guardian blog Animal Magic, one that proved incredibly popular. A few years ago, Egmond was in the Amsterdam University Library when she discovered an amazing collection of 16th-century drawings and watercolours of animals collected by the founding father of zoology Conrad Gessner and his fellow Swiss successor Felix Platter. These and many more illustrations feature in her new book on early modern natural history illustration, Eye For Detail (Reaktion Books, 2017) and I invited Egmond (with the kind permission of Amsterdam University Library) to put together a gallery