Is there any animal that does not sleep?
491592
fish usually sleep on the bottom of the tank and giraffes only sleep 30 min a day thats all i know
761847
Some of them are buoyant and sleep floating on the surface breathing air. Others can do what in humans is comparable to the "dead man's float" where you are under the water motionless then tilt your head back only, rise to the surface to breathe, tilt it back and resubmerge. Hippos can do this without ever waking up so I assume some marine mammals can too.
1103604
some animals in winters sleep ie the whone winter they sleep n this is not actual sleep but actually they appears dead ie no motion of body .There is no movement and it takes a long time for it to wake up enough to even walk around.before hibernation \nDuring the fall, hibernating animals eat more food than usual.  Their bodies will live off their body fat as they ‘sleep’ through winter.  The animal will use up the body fat it stores and not lose any muscle.  This causes the animal to come out of hibernation thinner but still as strong as it was in the fall.
358470
Dolphin's don't 'sleep' in the sense that we do. They do however have conscious control over their breathing like we do, in which case loosing consciousness in the ocean could be quite deadly. Research into this area suggests dolphins 'sleep' one cerebral hemisphere at a time, meaning they close down one half of their brain for a little while, letting the other half take care of the necessary functions such as breathing.
265124
well here in NH USA our black bears do hibernate.. they start to wake up in the late spring ... but the warm weather here has brought a few out \n\nthe old timers have heard them  so i would say yes for here any how
182101
i think they sleep. but they dont close their eyes. i think whent they remain still for a long time it means that they are asleep
625680
I don't believe that ants sleep because they are always busy doing something.
128829
WHERE DO YOU GET SUCH IDEAS GUYS..? IF IT HAPPENS, DOGS CANT SLEEP AT NIGHT..;-}
1179090
No. Where would I find such an animal?
295910
I am willing to bet that you are looking for the Elephant.  There are many sites on the web which have stated that the elephant is the only mammal which can not jump.  This is NOT the truth.\nJust on the Web alone there are several others listed including the okapi, guinea pig and raccoon who are also reported as not being able to jump.  (see references).\nIn the same class as the elephant, both Hippopotamus and Rhinoceroses come closer to skipping than jumping.  Like the elephant, their body mass is too great in relation to their mass.\nIn addition, all bats have weak legs and usually have trouble walking, let alone jumping.\nIt has been recorded that sloths move too slow to jump.  Plus they seldom climb down out of their trees.\nGiraffes are known to run, but apparently always have one “foot on the ground.”  Due to their neck structure, it may not be possible for them to jump in the usual meaning of the word.\nDue to their odd physical shapes and relatively slow speeds, echidna (spiny anteater), \nduck-billed platypus and koala might also be listed among the non-jumpers.\nFinally, there are the non-land mammals most of which can come at least part way out of the water, but none have legs and by definition, can not jump.  These would include whales, porpoises, dolphins, manatees and maybe even sea lions.
407248
any animal with 4 legs?
311429
Sleep is one of the last bastions of mystery that Science has yet to conquer. Despite several centuries of study, speculation, and debate, we still really don't know what sleep is or why we need to 'shut down' periodically. We know that all sorts of vertebrate animals – mammals, birds, reptiles, and at least some fishes – periodically enter a period of torpor characterized by a profound change in brain waves.\n\nBut when it comes to whether or not sharks sleep, we just don't know. There have been reports from all over the globe, including Mexico, Japan, and Australia, of sharks resting motionless in caves. These have been called "sleeping sharks", but I can attest that the eyes of these quiescent sharks do follow divers moving about in the caves with them, so they're definitely not asleep.\n\nIn his sweeping epic Paradise Lost, 17th Century English poet, John Milton, asked, "What hath night to do with sleep?" We know from sonic telemetry studies (the underwater equivalent of radio tracking) that at least some shark species -- such as the Reef Whitetip (Triaenodon obesus) and the Tiger Shark (Galeocerdo cuvier) -- are actually more active at night than during the day. Since schooling behavior is partially coordinated by vision, many other sharks are most active at dawn and dusk, when such prey is at a disadvantage. Studies such as these suggest that at least some sharks do not sleep at night.\n\nWe used to think that the Great White Shark (Carcharodon carcharias) was primarily active during the day. But it turns out that this is largely due to observer bias: humans tend to be diurnal rather than nocturnal, and it's very difficult to watch an underwater creature at night. Recent experiments by Peter Klimley using stationary telemetry pods placed along the bottom at the Farallon Islands, we have learned that White Sharks are quite active at night, when they probably feed primarily on bottom fishes. If these bottom fishes are sleeping when attacked, they're certainly in for a 'rude awakening'!\n\nBecause sharks rely on ram-ventilation -- that is, their forward swimming to push oxygen-bearing water through their mouths and over their gills -- this fact begs the question: do sharks sleep at all? Dolphins are conscious breathers, actually having to think about rising to the surface, opening their blowholes, and breathing. From Russian studies carried out in the early 1970's, we know that dolphins catnap in 2 to 3-minute stretches, actually shutting down one hemisphere of their brain at a time. From experiments carried out on a small shark called the Spiny Dogfish (Squalus acanthias), we know that the 'Central Pattern Generator' that co-ordinates swimming movements in sharks is not located in the brain, but in the spinal chord. Thus, it is possible for an unconscious shark to swim.\n\nThere is even a possibility that the sharks' fore, mid-, and hind- brain shut down in sequence, resulting in the shark equivalent of sleep-walking.\n\nI hope this answers your question.
1158484
Placentarian mammals do (not the platypus or equidna)
1166615
Yes, fishes sleep.\nNo, they sleep with their eyes open.\nYes, they stop swimming and are like a frozen statue in water except with eyes open.\n\nThey wake up from the slightest motion such as someone passing by, or lights going on in the room it is in.
1065426
Animals that lack eyelids.  In addition to fish and snakes true geckoes of the family Gekkonidae also lack eyelids.  Several cave dwelling salamander species with rudimentary eyes also lack eyelids.  Oh yeah, don't forget the most uncelebrated Squamates: The Amphisbaenians, they also lack eyelids.  Sorry for saying lack eyelids in every sentence.\n\nlack eyelids.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nI Lack Eyelids.........
814907
Actually the scientific community hasnt definitively decided yet what should or should not be classified as "true" hibernation. Compared to ground squirrels a bear seems to be only in a light sleep, but both animals go through similar process to get ready for winter etc... \n\nExcerpt from Wikipedia...\nOne animal that some consider to be a hibernator is the bear. However, the degree of metabolic depression is much less than what is observed in smaller mammals and many prefer to use the term denning. The bear's body temperature remains relatively stable (depressed from 37° C to approximately 31° C) and it can be easily aroused. In contrast, hibernating ground squirrels may have core body temperatures as low as -2° C.
760601
Dolphins have to be conscious to breath. This means that they cannot go into a full deep sleep, because then they would suffocate. Dolphins have "solved" that by letting one half of their brain sleep at a time. This has been determined by doing EEG studies on dolphins. Dolphins sleep about 8 hours day in this fashion. \n\nA dolphin's behavior when sleeping/resting depends on the circumstances and possibly on individual preferences. They can either:\n1. swim slowly and surface every now and then for a breath\n2. rest at the surface with their blowhole exposed \n3. rest on the bottom (in shallow water) and rise to the surface every now and then to breath.