When do fish sleep?

Answer 1

When they are tired!

Answer 2

definite, your fish DO sleep, generally at night while the lighting fixtures are out (I do wish in case you have a tank with a mild which you turn it off so the fish can sleep) ... the variety of 'float' to the backside of the tank, or into the flowers and don't pass until the mild comes decrease back on. I incredibly have 2 oscars, and while they have been small, I used to think of the albino tiger grow to be ill by way of fact each and every morning i might arise and it may well be leaning against the glass on the backside of the tank, whilst the different one (black tiger) may well be in the midst of the tank on the backside and sitting up straighter ... they're the two approximately 10" now, and are quite healthful ... and that i now can tell while my different fish are 'asleep' by ability of how they 'swim' (particularly, they are not swimming while they're asleep, they only take a seat nonetheless for long sessions) ... so watch your fish and you will see that they DO sleep, purely generally no longer while there are people around watching them.

Answer 3

Fish, like all creatures need down time and DO sleep, when is dark. Because they don't have eyelids we cannot tell when they are sleeping. Certain species change colors while sleeping, this is to "camouflage" themselves with the environment and protect themselves from predators.

Answer 4

Well, my fish sleep when I turn the light off.

Answer 5

fishes did don't have eyelids, so they can not really sleep. Instead of sleep, they go into a rest like status. Different type of fish have different rest patterns.

Answer 6

Around the clock in New Jersey.

That is where they have you sleeping with the fishes.

Answer 7

This is a complex question with no simple answer. Deciding if a fish is asleep depends on many factors, one of which is the definition of sleep.

In humans, the transition to sleep (or even closing the eyes) involves specified changes in the pattern of brain waves in the area of the brain called the neocortex. Fishes don't have the same degree of neocortical development as mammals and thus don't display these brain-wave patterns associated with sleep (view figure of a shark brain). So, as far as brain-wave patterns go, fishes don't sleep.

If, however, you define sleep as a combination of a reduced metabolic rate, slowed physical activity, lowered response to stimuli and the assumption of a resting posture, then many fishes do sleep. Perhaps the best-known 'sleepers' are the parrotfishes (family Scaridae). Many parrotfishes find a suitable spot on the seafloor and secrete a mucus envelope in which they spend the night.

Such fishes normally swim away from a diver by day, but can easily be approached and even gently handled at night. Many fishes, however, seem not to sleep. Pelagic (glossary) species such as tunas and some sharks never stop swimming. One theory suggests that during sleep, sensory information (predominantly visual) gathered during the day is processed to form memories. Fishes that swim constantly in blue oceanic waters receive little 'unusual' visual input and require less 'memory-processing time' and thus need no sleep. This is supported by studies on several species of blind fishes that live in caves. These sightless fishes do not sleep.

Having said all that, though, I did enjoy the simple answer of a young neighbour who told me with confidence that fish can't sleep because they don't have eyelids.

Answer 8

Whatever it is time for fish to sleep.

Answer 9

Fish rest ! Rather than sleep,honey!
I have 10 tropical aquariums!
They have no eyelids so they don't sleep but have to depend on darkness to rest!
That is why it is important to turn the lights out at night!...hmm

Answer 10

When they swim in one spot for a period of time, they appear to be in an energy saving state. This could be sleep, or at least some a form of rest. Good Question, TC.

Answer 11

...most fish spend time in an energy saving state that can be called
"rest", and we might even call it sleep, but it's not sleep like mammals experience