Sperm Whales Sleep Upside Down....And It's One Of The Coolest Things I've Ever Seen.

Sperm whales are the largest of the toothed whales and one of the largest types of whales that exist. There's something mysterious about most sea creatures, but this video of sperm whales sleeping is one of the most unbelievable things I've seen in a long time. Sperm whales sleep vertically with a stillness that is almost eerie. It is believed that sperm whales only sleep for about 12 minutes at a time.