2006-06-19 16:03:35 · 10 answers · asked by gctile 1 in Science & Mathematics ➔ Zoology
Yes.
They do not close their eyes, however,and they don't sleep in the same way that we do. They have active and inactive periods but they have to keep moving in order to breathe.
Nurse sharks have been observed resting motionless on the sea floor with strong currents racing over their gills so they can breath without moving.
2006-06-19 16:06:15 · answer #1 · answered by Texas Cowboy 7 · 16⤊ 1⤋
Yes ... some sharks remain in a perpetual state of swimming while in a "sleep" state; others can settle down near caves and rocky outcroppings/coral reefs and just sit there
They do not have an opaque eyelid, so their eyes remain "open". Some may lower their nictating membrane as protection for their eye during their resting state (also a protective layer seen when a shark bites a prey item).
2006-06-19 23:31:03 · answer #2 · answered by icehoundxx 6 · 0⤊ 0⤋
Sleep is nothing more than a reduced rate of activity. All mammals, birds and fish (that includes sharks) 'sleep'.
2006-06-19 23:07:48 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Depends on the type of shark.
2006-06-19 23:07:35 · answer #4 · answered by ajax_spaid 2 · 0⤊ 0⤋
Actually, sharks do not have a swim bladder, they do sleep, but they cannot stop swimming. or they will sink.
2006-06-20 01:11:12 · answer #5 · answered by Beth 2 · 0⤊ 0⤋
never coz if they sleep, theyll sink coz they dnt hav air bladders to keep them afloat
2006-06-20 03:39:58 · answer #6 · answered by scorpioash19 1 · 0⤊ 0⤋
they sleep but they don't have eyelids so people don't know if they are sleeping or not, they sleep with their eyes open freaky
2006-06-19 23:22:44 · answer #7 · answered by tonyma90 4 · 0⤊ 0⤋
Yes, but they have too keep swimming or they can't breathe.
2006-06-19 23:26:59 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Yep!
2006-06-19 23:07:31 · answer #9 · answered by Anonymous · 0⤊ 0⤋
yes while swimming
2006-06-19 23:06:42 · answer #10 · answered by Anonymous · 0⤊ 0⤋