Sleepy Tabs is a free Chrome extension developed by Yougli that helps you manage your tabs and save memory. This extension automatically puts tabs to sleep if they haven't been viewed after a set number of minutes, which can be adjusted in the options.

One of the key features of Sleepy Tabs is the ability to exclude certain domains from being put to sleep. This means that if you have important web apps or websites that you want to keep active, you can add them to the exclude list in the options. This way, you can still receive notifications from these web apps while keeping your memory usage low.

When you open a tab that has been put to sleep, Sleepy Tabs automatically wakes it up and reloads the content. This ensures that you can quickly access the tab without any delay.

With Sleepy Tabs, you can keep all your favorite tabs open without worrying about excessive RAM consumption. It's a great tool for those who like to have multiple tabs open at once but don't want to sacrifice their computer's performance.