How Do We Know We’re Tired?

Go to http://Brilliant.org/SciShow to try their Applied Probability course. Sign up now and get 20% off an annual Premium subscription. Sleep is complicated. And there's still a lot we don't know about it, but zebrafish larvae are a surprisingly good place to look to learn more about what makes us sleepy. Hosted by: Hank Green SciShow is on TikTok! Check us out at https://www.tiktok.com/@scishow ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Chris Peters, Matt Curls, Kevin Bealer, Jeffrey Mckishen, Jacob, Christopher R Boucher, Nazara, Jason A Saslow, charles george, Christoph Schwanke, Ash, Bryan Cloer, Silas Emrys, Eric Jensen, Adam Brainard, Piya Shedden, Jeremy Mysliwiec, Alex Hackman, GrowingViolet, Sam Lutfi, Alisa Sherbow, Dr. Melvin Sanicas, Melida Williams, Tom Mosner ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: http://www.scishowtangents.org Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow ---------- Sources: https://www.sciencedirect.com/science/article/abs/pii/S1097276521009333?via%3Dihub https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5465131/ https://www.sciencedirect.com/science/article/pii/S2451994417300068 https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0050277 Images: https://www.istockphoto.com/photo/man-snores-at-night-gm1225328904-360616144 https://www.storyblocks.com/video/stock/extremely-tired-overworked-woman-yawning-and-expressing-exhaustion-inside-during-the-day-h6qbv2eqwj7ckwpm7 https://www.istockphoto.com/vector/circadian-rhythm-human-biological-clock-gm1267110107-371661187 https://www.cdc.gov/niosh/work-hour-training-for-nurses/longhours/mod2/11.html https://commons.wikimedia.org/wiki/File:DNA_UV_mutation.svg https://www.istockphoto.com/photo/tired-young-woman-sleeping-on-couch-at-home-gm1258280097-368967365 https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_7598_larval_zebra.jpg https://commons.wikimedia.org/wiki/File:Protein_PARP1_PDB_1uk0.png https://www.flickr.com/photos/nichd/17104754320 https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0020148 https://www.istockphoto.com/vector/seamless-black-dice-isolated-on-white-gm1307376965-397661859 https://www.istockphoto.com/vector/dna-molecular-break-gm472349465-26385996