I guess no human can know the real answer, but it sure looks like my female guppies know what time to go to bed!
Each night around 8:30pm, the guppies gather in the quiet shady corner and go to sleep. It doesn't matter if the light is still on. If doesn't matter if I'm watching them. I don't have the light on a timer, nor do I feed them at the same time every night. I just wonder how they can be so consistent at going to sleep without some external trigger that tells them it's time to sleep...
Anyone else observe such behavior?
