Cows can sleep standing up, but they can only dream lying down.
745
Lack of water is the #1 trigger of daytime fatigue.
148
You forget 90% of your dreams.
256
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
You burn more calories sleeping than you do watching television.
348