Waking and sleeping It is often asked how – or if – bees are awake or asleep. Bees do not sleep – but they do remain motionless to preserve vital energy for the next day of foraging. During the day, and out on their travels, bees eyes can detect a wide array of colour. Their eyes are sensitive more to the blue end of the spectrum and into ultra violet. Flowers reflect large amounts of ultra violet light and to a bee will be very bright. Curiously, when it comes to red, bees are totally blind.