Maybe it's haunted by some past events or fears. That could keep it awake.
The skeleton in the comic can't sleep might be because of a magical curse or a disturbance in the spiritual realm it inhabits. Maybe it's constantly on guard against some unseen threat.
It could be due to stress or an irregular sleep schedule. Maybe there is a comic that explores this issue, but I'm not sure.
Maybe it's because the images or the music in the caramelldansen rage comic are too stimulating for your mind and keep you wired.
Maybe the bear is too excited or worried about something. That could keep it awake.
Maybe the little bear is too excited or has a lot on its mind.
It could be because not sleeping makes you stressed and irritable, and that stress might come out in the form of creating or relating to rage comics.
It's often because the scary elements get stuck in your mind and make you anxious or nervous, keeping you from relaxing enough to sleep.
Maybe it's because the comic is too exciting and keeps your mind active.
Maybe it's because the comics are too exciting and keep your mind active.
Maybe it's because the content in the cellphone comics is too exciting or stimulating, which keeps your brain active and makes it hard to relax and fall asleep.
Maybe there's a glitch or technical issue. Try restarting your device or the app you're using to see if that helps.