Sleep | smithsonianmag.comhttps://www.smithsonianmag.com/rss/tag/sleep/RSS feed for SleepenMon, 22 Jun 2026 20:35:03 +0000Fish and Humans Share Surprisingly Similar Sleep Habits, Including Daytime Napshttps://www.smithsonianmag.com/smart-news/fish-and-humans-share-surprisingly-similar-sleep-habits-including-daytime-naps-180988985/A recent study suggests that zebrafish have four sleep substates, just like humans do—and one of them is akin to an afternoon snoozeMon, 22 Jun 2026 20:35:03 +0000https://www.smithsonianmag.com/smart-news/fish-and-humans-share-surprisingly-similar-sleep-habits-including-daytime-naps-180988985/